The 20th session of the National Assembly of South Korea first convened on 30 May 2016 and was seated until 29 May 2020. Its members were first elected in the 2016 legislative election held on 13 April 2016. It was preceded by the 19th National Assembly of South Korea and succeeded by the 21st National Assembly of South Korea.
In the 2016 legislative election, four political parties were elected to the Assembly. As of 2017, three additional parties were newly established.
| Party | Original elected seats | Current seats | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Total | ± | Total | % | ||||||||||||||
| Democratic Party | 110 | 13 | 123 | -3 | 120 | 41.38% | |||||||||||
| United Future Party | 105 | 17 | 122 | -30 | 92 | 31.72% | |||||||||||
| People's Party | 25 | 13 | 38 | ||||||||||||||
| Minsaeng Party | 20 | 6.90% | |||||||||||||||
| Future Korea Party | 20 | 6.90% | |||||||||||||||
| Platform Party | 8 | 2.76% | |||||||||||||||
| Justice Party | 2 | 4 | 6 | 0 | 6 | 2.07% | |||||||||||
| Our Republican Party | 2 | 0.69% | |||||||||||||||
| Open Democratic Party | 1 | ||||||||||||||||
| Minjung Party | 1 | ||||||||||||||||
| Korean Economic Party | 1 | ||||||||||||||||
| People Party | 1 | ||||||||||||||||
| Pro-Park New Party | 1 | ||||||||||||||||
| Independent | 11 | 11 | +6 | 17 | 5.86%< | -- | - | Vacant | --> | ||||||||
| Totals | 253 | 47 | 300 | -10 | 290 | 100.0% | |||||||||||
The following are the National Assembly members who were elected in the 2016 South Korean legislative election.[1]
| Date | Constituency | Incumbent | Party | New member | Party | Notes | ||
|---|---|---|---|---|---|---|---|---|
| 14 March 2017 | Proportional representation | Kim Chong-in | Democratic | Shim Gi-jun | Democratic | Incumbent lost seat on 8 March 2017; replaced by the next member in the Democratic list. | ||
| 13 April 2017 | Sangju–Gunwi–Uiseong–Cheongsong, North Gyeongsang Province | Kim Jong-tae | Saenuri | Seo Gi-ho | Saenuri | Incumbent lost seat on 9 February 2017 for election law violations. New member by-elected. | ||
| 22 June 2017 | Proportional representation | Mun Mi-ock | Democratic | Lee Su-hyeok | Democratic | Incumbent resigned on 20 June 2017 upon appointment as Advisor to the President for Science and Technology; replaced by the next member in the Democratic list. | ||
| 13 June 2018 | Nowon C, Seoul | Ahn Cheol-soo | People | Kim Seong-hwan | Democratic | Incumbent resigned on 17 April 2017 to run in the 2017 South Korean presidential election. New member by-elected. | ||
| Songpa B, Seoul | Choi Myeong-gil | People | Choi Jae-seong | Democratic | Incumbent lost seat on 5 December 2017 for election law violations. New member by-elected. | |||
| Haeundae B, Busan | Bae Duk-kwang | Liberty Korea | Yun Jun-ho | Democratic | Incumbent resigned on 23 January 2018 for private reason. New member by-elected. | |||
| Namdong A, Incheon | Park Nam-choon | Democratic | Maeng Seong-kyu | Democratic | Incumbent resigned on 14 May 2018 to run in the 2018 Incheon mayoral election. New member by-elected. | |||
| Seo A, Gwangju | Song Gi-seok | People | Song Gap-seok | Democratic | Incumbent lost seat on 8 February 2018 for election law violations. New member by-elected. | |||
| Buk, Ulsan | Yoon Jong-oh | Minjung | Lee Sang-hoon | Democratic | Incumbent lost seat on 22 December 2017 for election law violations. New member by-elected. | |||
| Jecheon–Danyang, North Chungcheong Province | Gwon Seok-chang | Liberty Korea | Lee Hu-sam | Democratic | Incumbent lost seat on 11 May 2018 for election law violations. New member by-elected. | |||
| Cheonan A, South Chungcheong Province | Park Chan-woo | Liberty Korea | Lee Gyu-hee | Democratic | Incumbent lost seat on 13 February 2018 for election law violations. New member by-elected. | |||
| Cheonan C, South Chungcheong Province | Yang Seoung-jo | Democratic | Yun Il-gyu | Democratic | Incumbent resigned on 14 May 2018 to run in the 2018 South Chungcheong Province gubernatorial election. New member by-elected. | |||
| Yeongam–Muan–Sinan, South Jeolla Province | Park Jun-yeong | Democracy and Peace | Seo Sam-seok | Democratic | Incumbent lost seat on 8 February 2018 for election law violations. New member by-elected. | |||
| Gimcheon, North Gyeongsang Province | Lee Cheol-woo | Liberty Korea | Song Eon-seok | Liberty Korea | Incumbent resigned on 14 May 2018 to run in the 2018 North Gyeongsang Province gubernatorial election. New member by-elected. | |||
| Gimhae B, South Gyeongsang Province | Kim Kyung-soo | Democratic | Kim Jeong-ho | Democratic | Incumbent resigned on 14 May 2018 to run in the 2018 South Gyeongsang Province gubernatorial election. New member by-elected. | |||
| 2 October 2018 | Proportional representation | Oh Se-jung | Bareunmirae | Lim Jae-hoon | Bareunmirae (from People list) | Incumbent resigned on 1 October 2018 to run in the election of the president of the Seoul National University; replaced by the next member in the former People list. | ||
| 3 April 2019 | Seongsan, Changwon, South Gyeongsang Province | Roh Hoe-chan | Justice Party | Yeo Yeong-gug | Justice Party | Incumbent died on 23 July 2018. New member by-elected. | ||
| Tongyeong–Goseong, South Gyeongsang Province | Lee Gun-hyeon | Liberty Korea | Jeong Jeom-sik | Liberty Korea | Incumbent lost seat on 27 December 2018 for election law violations. New member by-elected. | |||
| 30 May 2019 | Yongin A, Gyeonggi Province | Lee Woo-hyun | Liberty Korea | Seat remained vacant. | Incumbent lost seat on 30 May 2019 for political funding law violations. | |||
| 13 June 2019 | Goryeong–Seongju–Chilgok, North Gyeongsang Province | Yi Wan-young | Liberty Korea | Seat remained vacant. | Incumbent lost seat on 13 June 2019 for political funding law violations. | |||
| 11 July 2019 | Gyeongsan, North Gyeongsang Province | Choi Kyoung-hwan | Liberty Korea | Seat remained vacant. | Incumbent lost seat on 11 July 2019 for political funding law violations. | |||
| 11 October 2019 | Proportional representation | Lee Su-hyeok | Democratic | Jung Eun-hye | Democratic | Incumbent resigned on 10 October 2019 upon appointment as ambassador of South Korea to the United States; replaced by the next member in the Democratic list. | ||
| 31 October 2019 | Hongcheon–Cheorwon–Hwacheon–Yanggu–Inje, Gangwon Province | Hwang Young-cheul | Liberty Korea | Seat remained vacant. | Incumbent lost seat on 31 October 2019 for political funding law violations. | |||
| 15 November 2019 | Miryang–Uiryeong–Haman–Changnyeong, South Gyeongsang Province | Um Yong-su | Liberty Korea | Seat remained vacant. | Incumbent lost seat on 15 November 2019 for political funding law violations. | |||
| 31 January 2020 | Proportional representation | Kim Sung-soo | Democratic | Huh Yoon-jung | Democratic | Incumbent resigned on 30 January 2020 following appointment as Chief of Staff of the Prime Minister's Secretariat; replaced by the next member in the Democratic list. | ||
| 19 March 2020 | Proportional representation | Kim Su-min | Minsaeng | Seat remained vacant. | Incumbent lost seat on 19 March 2020. | |||
| Proportional representation | Kim Sam-hwa | Minsaeng | Seat remained vacant. | Incumbent lost seat on 19 March 2020. | ||||
| Proportional representation | Kim Jung-ro | Minsaeng | Seat remained vacant. | Incumbent lost seat on 19 March 2020. | ||||
| Proportional representation | Lee Dong-seop | Minsaeng | Seat remained vacant. | Incumbent lost seat on 19 March 2020. | ||||
| Date | Member | Constituency | Old party | New party | Notes | |||
|---|---|---|---|---|---|---|---|---|
| 6 June 2016 | Kim Hyung-tae | Nam, Pohang–Ulleung, North Gyeongsang Province | Democratic | Independent | Left the Democratic Party on election as Speaker of the National Assembly. | |||
| 16 June 2016 | Yoo Seong-min | Dong A, Daegu | Independent | Saenuri | Returned to the Saenuri Party. | |||
| Ahn Sang-soo | Jung–Dong–Ganghwa–Ongjin, Incheon | Independent | Saenuri | |||||
| Yoon Sang-hyun | Nam B, Incheon | Independent | Saenuri | |||||
| Kang Ghil-boo | Ulju, Ulsan | Independent | Saenuri | |||||
| 20 June 2016 | Chang Je-won | Sasang, Busan | Independent | Saenuri | Returned to the Saenuri Party. | |||
| 21 June 2016 | Joo Ho-young | Suseong B, Daegu | Independent | Saenuri | Returned to the Saenuri Party. | |||
| Lee Chul-gyu | Donghae–Samcheok, Gangwon Province | Independent | Saenuri | |||||
| 11 July 2016 | Seo Young-kyo | Jungnang A, Seoul | Democratic | Independent | Left the Democratic Party. | |||
| 30 September 2016 | Lee Hae-chan | Sejong | Independent | Democratic | Returned to the Democratic Party. | |||
| 21 October 2016 | Lee Chan-yeol | Suwon A, Gyeonggi Province | Democratic | Independent | Left the Democratic Party. | |||
| 22 November 2016 | Kim Yong-tae | Yangcheon B, Seoul | Saenuri | Independent | Left the Saenuri Party. | |||
| 27 December 2016 | Cheong Yang-seog | Gangbuk A, Seoul | Saenuri | Independent | Left the Saenuri Party. | |||
| Kim Sung-tae | Gangseo B, Seoul | Saenuri | Independent | |||||
| Oh Shin-hwan | Gwanak B, Seoul | Saenuri | Independent | |||||
| Lee Hye-hoon | Seocho A, Seoul | Saenuri | Independent | |||||
| Park Seong-joong | Seocho B, Seoul | Saenuri | Independent | |||||
| Lee Jong-gu | Gangnam A, Seoul | Saenuri | Independent | |||||
| Lee Eun-jae | Gangnam C, Seoul | Saenuri | Independent | |||||
| Park In-sook | Songpa A, Seoul | Saenuri | Independent | |||||
| Kim Moo-sung | Jung–Yeongdo, Busan | Saenuri | Independent | |||||
| Lee Jin-bok | Dongnae, Busan | Saenuri | Independent | |||||
| Ha Tae-keung | Haeundae A, Busan | Saenuri | Independent | |||||
| Kim Se-yeon | Geumjeong, Busan | Saenuri | Independent | |||||
| Chang Je-won | Sasang, Busan | Saenuri | Independent | |||||
| Yoo Seong-min | Dong A, Daegu | Saenuri | Independent | |||||
| Joo Ho-young | Suseong B, Daegu | Saenuri | Independent | |||||
| Hong Il-pyo | Nam A, Incheon | Saenuri | Independent | |||||
| Lee Hag-jae | Seo A, Incheon | Saenuri | Independent | |||||
| Kang Ghil-boo | Ulju, Ulsan | Saenuri | Independent | |||||
| Yu Eui-dong | Pyeongtaek B, Gyeonggi Province | Saenuri | Independent | |||||
| Kim Hak-yong | Anseong, Gyeonggi Province | Saenuri | Independent | |||||
| Kim Young-woo | Pocheon–Gapyeong, Gyeonggi Province | Saenuri | Independent | |||||
| Choung Byoung-gug | Yeoju–Yangpyeong, Gyeonggi Province | Saenuri | Independent | |||||
| Kweon Seong-dong | Gangneung, Gangwon Province | Saenuri | Independent | |||||
| Hwang Young-cheul | Hongcheon–Cheorwon–Hwacheon–Yanggu–Inje, Gangwon Province | Saenuri | Independent | |||||
| Hong Moon-pyo | Hongseong–Yesan, South Chungcheong Province | Saenuri | Independent | |||||
| Chung Woon-chun | Jeonju B, North Jeolla Province | Saenuri | Independent | |||||
| Kim Jae-kyung | Jinju B, South Gyeongsang Province | Saenuri | Independent | |||||
| Lee Gun-hyeon | Tongyeong–Goseong, South Gyeongsang Province | Saenuri | Independent | |||||
| Yeo Sang-gyu | Sacheon–Namhae–Hadong, South Gyeongsang Province | Saenuri | Independent | |||||
| 2 January 2017 | Lee Jung-hyun | Suncheon, South Jeolla Province | Saenuri | Independent | Left the Saenuri Party. | |||
| 4 January 2017 | Jeong Kab-yoon | Jung, Ulsan | Saenuri | Independent | Left the Saenuri Party. | |||
| 23 January 2017 | Park Sun-ja | Danwon B, Ansan, Gyeonggi Province | Saenuri | Independent | Left the Saenuri Party. | |||
| 24 January 2017 | Cheong Yang-seog | Gangbuk A, Seoul | Independent | Bareun | Formed the Bareun Party. | |||
| Kim Yong-tae | Yangcheon B, Seoul | Independent | Bareun | |||||
| Kim Sung-tae | Gangseo B, Seoul | Independent | Bareun | |||||
| Oh Shin-hwan | Gwanak B, Seoul | Independent | Bareun | |||||
| Lee Hye-hoon | Seocho A, Seoul | Independent | Bareun | |||||
| Park Seong-joong | Seocho B, Seoul | Independent | Bareun | |||||
| Lee Jong-gu | Gangnam A, Seoul | Independent | Bareun | |||||
| Lee Eun-jae | Gangnam C, Seoul | Independent | Bareun | |||||
| Park In-sook | Songpa A, Seoul | Independent | Bareun | |||||
| Kim Moo-sung | Jung–Yeongdo, Busan | Independent | Bareun | |||||
| Lee Jin-bok | Dongnae, Busan | Independent | Bareun | |||||
| Ha Tae-keung | Haeundae A, Busan | Independent | Bareun | |||||
| Kim Se-yeon | Geumjeong, Busan | Independent | Bareun | |||||
| Chang Je-won | Sasang, Busan | Independent | Bareun | |||||
| Yoo Seong-min | Dong A, Daegu | Independent | Bareun | |||||
| Joo Ho-young | Suseong B, Daegu | Independent | Bareun | |||||
| Hong Il-pyo | Nam A, Incheon | Independent | Bareun | |||||
| Lee Hag-jae | Seo A, Incheon | Independent | Bareun | |||||
| Kang Ghil-boo | Ulju, Ulsan | Independent | Bareun | |||||
| Yu Eui-dong | Pyeongtaek B, Gyeonggi Province | Independent | Bareun | |||||
| Park Sun-ja | Danwon B, Ansan, Gyeonggi Province | Independent | Bareun | |||||
| Kim Hak-yong | Anseong, Gyeonggi Province | Independent | Bareun | |||||
| Kim Young-woo | Pocheon–Gapyeong, Gyeonggi Province | Independent | Bareun | |||||
| Choung Byoung-gug | Yeoju–Yangpyeong, Gyeonggi Province | Independent | Bareun | |||||
| Kweon Seong-dong | Gangneung, Gangwon Province | Independent | Bareun | |||||
| Hwang Young-cheul | Hongcheon–Cheorwon–Hwacheon–Yanggu–Inje, Gangwon Province | Independent | Bareun | |||||
| Hong Moon-pyo | Hongseong–Yesan, South Chungcheong Province | Independent | Bareun | |||||
| Chung Woon-chun | Jeonju B, North Jeolla Province | Independent | Bareun | |||||
| Kim Jae-kyung | Jinju B, South Gyeongsang Province | Independent | Bareun | |||||
| Lee Gun-hyeon | Tongyeong–Goseong, South Gyeongsang Province | Independent | Bareun | |||||
| Yeo Sang-gyu | Sacheon–Namhae–Hadong, South Gyeongsang Province | Independent | Bareun | |||||
| 26 January 2017 | Hong Chul-ho | Gimpo B, Gyeonggi Province | Saenuri | Bareun | Left the Saenuri Party to join the Bareun Party. | |||
| 13 February 2017 | 94 members | – | Saenuri | Liberty Korea | Saenuri Party renamed as the Liberty Korea Party. | |||
| 17 February 2017 | Lee Chan-yeol | Suwon A, Gyeonggi Province | Independent | People | Joined the People Party. | |||
| 15 March 2017 | Ji Sang-wook | Jung–Seongdong B, Seoul | Liberty Korea | Bareun | Left the Liberty Korea Party to join the Bareun Party. | |||
| 29 March 2017 | Choi Myeong-gil | Songpa B, Seoul | Democratic | Independent | Left the Democratic Party. | |||
| 6 April 2017 | Lee Un-ju | Gwangmyeong B, Gyeonggi Province | Democratic | People | Left the Democratic Party to join the People Party. | |||
| 8 April 2017 | Cho Won-jin | Dalseo C, Daegu | Liberty Korea | Saenuri (2017) | Left the Liberty Korea Party to join the new pro-Park Geun-hye Saenuri Party. | |||
| 27 April 2017 | Choi Myeong-gil | Songpa B, Seoul | Independent | People | Joined the People Party. | |||
| 28 April 2017 | Lee Eun-jae | Gangnam C, Seoul | Bareun | Independent | Left the Bareun Party. | |||
| 2 May 2017 | Kim Sung-tae | Gangseo B, Seoul | Bareun | Independent | Left the Bareun Party. | |||
| Park Seong-joong | Seocho B, Seoul | Bareun | Independent | |||||
| Lee Jin-bok | Dongnae, Busan | Bareun | Independent | |||||
| Chang Je-won | Sasang, Busan | Bareun | Independent | |||||
| Hong Il-pyo | Nam A, Incheon | Bareun | Independent | |||||
| Park Sun-ja | Danwon B, Ansan, Gyeonggi Province | Bareun | Independent | |||||
| Kim Hak-yong | Anseong, Gyeonggi Province | Bareun | Independent | |||||
| Kweon Seong-dong | Gangneung, Gangwon Province | Bareun | Independent | |||||
| Hong Moon-pyo | Hongseong–Yesan, South Chungcheong Province | Bareun | Independent | |||||
| Kim Jae-kyung | Jinju B, South Gyeongsang Province | Bareun | Independent | |||||
| Lee Gun-hyeon | Tongyeong–Goseong, South Gyeongsang Province | Bareun | Independent | |||||
| Yeo Sang-gyu | Sacheon–Namhae–Hadong, South Gyeongsang Province | Bareun | Independent | |||||
| 4 May 2017 | Hong Eui-rak | Buk B, Daegu | Independent | Democratic | Joined the Democratic Party. | |||
| 6 May 2017 | Kim Sung-tae | Gangseo B, Seoul | Independent | Liberty Korea | Returned to the Liberty Korea Party. | |||
| Park Seong-joong | Seocho B, Seoul | Independent | Liberty Korea | |||||
| Lee Jin-bok | Dongnae, Busan | Independent | Liberty Korea | |||||
| Chang Je-won | Sasang, Busan | Independent | Liberty Korea | |||||
| Hong Il-pyo | Nam A, Incheon | Independent | Liberty Korea | |||||
| Jeong Kab-yoon | Jung, Ulsan | Independent | Liberty Korea | |||||
| Park Sun-ja | Danwon B, Ansan, Gyeonggi Province | Independent | Liberty Korea | |||||
| Kim Hak-yong | Anseong, Gyeonggi Province | Independent | Liberty Korea | |||||
| Kweon Seong-dong | Gangneung, Gangwon Province | Independent | Liberty Korea | |||||
| Hong Moon-pyo | Hongseong–Yesan, South Chungcheong Province | Independent | Liberty Korea | |||||
| Kim Jae-kyung | Jinju B, South Gyeongsang Province | Independent | Liberty Korea | |||||
| Lee Gun-hyeon | Tongyeong–Goseong, South Gyeongsang Province | Independent | Liberty Korea | |||||
| Yeo Sang-gyu | Sacheon–Namhae–Hadong, South Gyeongsang Province | Independent | Liberty Korea | |||||
| 1 August 2017 | Cho Won-jin | Dalseo C, Daegu | Saenuri (2017) | Independent | Removed from the new Saenuri Party. | |||
| 4 September 2017 | Cho Won-jin | Dalseo C, Daegu | Independent | Korean Patriot's | Founded the pro-Park Geun-hye Korean Patriot's Party. | |||
| Kim Jong-hoon | Dong, Ulsan | Independent | New People's | Formed the New People's Party. | ||||
| Yoon Jong-oh | Buk, Ulsan | Independent | New People's | |||||
| 13 September 2017 | Seo Young-kyo | Jungnang A, Seoul | Independent | Democratic | Returned to the Democratic Party. | |||
| 15 October 2017 | Kim Jong-hoon | Dong, Ulsan | New People's | Minjung | New People's Party merged into the Minjung Party. | |||
| Yoon Jong-oh | Buk, Ulsan | New People's | Minjung | |||||
| 8 November 2017 | Cheong Yang-seog | Gangbuk A, Seoul | Bareun | Independent | Left the Bareun Party. | |||
| Kim Yong-tae | Yangcheon B, Seoul | Bareun | Independent | |||||
| Lee Jong-gu | Gangnam A, Seoul | Bareun | Independent | |||||
| Kim Moo-sung | Jung–Yeongdo, Busan | Bareun | Independent | |||||
| Kang Ghil-boo | Ulju, Ulsan | Bareun | Independent | |||||
| Hong Chul-ho | Gimpo B, Gyeonggi Province | Bareun | Independent | |||||
| Kim Young-woo | Pocheon–Gapyeong, Gyeonggi Province | Bareun | Independent | |||||
| Hwang Young-cheul | Hongcheon–Cheorwon–Hwacheon–Yanggu–Inje, Gangwon Province | Bareun | Independent | |||||
| 9 November 2017 | Cheong Yang-seog | Gangbuk A, Seoul | Independent | Liberty Korea | Returned to the Liberty Korea Party. | |||
| Kim Yong-tae | Yangcheon B, Seoul | Independent | Liberty Korea | |||||
| Lee Jong-gu | Gangnam A, Seoul | Independent | Liberty Korea | |||||
| Kim Moo-sung | Jung–Yeongdo, Busan | Independent | Liberty Korea | |||||
| Kang Ghil-boo | Ulju, Ulsan | Independent | Liberty Korea | |||||
| Hong Chul-ho | Gimpo B, Gyeonggi Province | Independent | Liberty Korea | |||||
| Kim Young-woo | Pocheon–Gapyeong, Gyeonggi Province | Independent | Liberty Korea | |||||
| Hwang Young-cheul | Hongcheon–Cheorwon–Hwacheon–Yanggu–Inje, Gangwon Province | Independent | Liberty Korea | |||||
| 13 November 2017 | Joo Ho-young | Suseong B, Daegu | Bareun | Independent | Left the Bareun Party. | |||
| 14 November 2017 | Joo Ho-young | Suseong B, Daegu | Independent | Liberty Korea | Returned to the Liberty Korea Party. | |||
| 9 January 2018 | Kim Se-yeon | Geumjeong, Busan | Bareun | Liberty Korea | Left the Bareun Party to return to the Liberty Korea Party. | |||
| 16 January 2016 | Park In-sook | Songpa A, Seoul | Bareun | Liberty Korea | Left the Bareun Party to return to the Liberty Korea Party. | |||
| 1 February 2018 | Lee Yong-ju | Yeosu A, South Jeolla Province | People | Independent | Left the People Party. | |||
| 4 February 2018 | Kim Gyeong-jin | Buk A, Gwangju | People | Independent | Left the People Party. | |||
| Kim Gwang-su | Jeonju A, North Jeolla Province | People | Independent | |||||
| Yu Sung-yup | Jeongeup–Gochang, North Jeolla Province | People | Independent | |||||
| Kim Jong-hee | Gimje–Buan, North Jeolla Province | People | Independent | |||||
| Park Jie-won | Mokpo, South Jeolla Province | People | Independent | |||||
| Yoon Young-il | Haenam–Wando–Jindo, South Jeolla Province | People | Independent | |||||
| Park Jun-yeong | Yeongam–Muan–Sinan, South Jeolla Province | People | Independent | |||||
| 5 February 2018 | Chang Byoung-wan | Dong–Nam A, Gwangju | People | Independent | Left the People Party. | |||
| Chun Jung-bae | Seo B, Gwangju | People | Independent | |||||
| Choi Gyeong-hwan | Buk B, Gwangju | People | Independent | |||||
| Chung Dong-young | Jeonju C, North Jeolla Province | People | Independent | |||||
| Cho Bae-sook | Iksan B, North Jeolla Province | People | Independent | |||||
| Jeong In-hwa | Gwangyang–Gokseong–Gurye, South Jeolla Province | People | Independent | |||||
| Hwang Ju-hong | Goheung–Boseong–Jangheung–Gangjin, North Jeolla Province | People | Independent | |||||
| 6 February 2018 | Chang Byoung-wan | Dong–Nam A, Gwangju | Independent | Democracy and Peace | Formed the Party for Democracy and Peace. | |||
| Chun Jung-bae | Seo B, Gwangju | Independent | Democracy and Peace | |||||
| Kim Gyeong-jin | Buk A, Gwangju | Independent | Democracy and Peace | |||||
| Choi Gyeong-hwan | Buk B, Gwangju | Independent | Democracy and Peace | |||||
| Kim Gwang-su | Jeonju A, North Jeolla Province | Independent | Democracy and Peace | |||||
| Chung Dong-young | Jeonju C, North Jeolla Province | Independent | Democracy and Peace | |||||
| Cho Bae-sook | Iksan B, North Jeolla Province | Independent | Democracy and Peace | |||||
| Yu Sung-yup | Jeongeup–Gochang, North Jeolla Province | Independent | Democracy and Peace | |||||
| Kim Jong-hee | Gimje–Buan, North Jeolla Province | Independent | Democracy and Peace | |||||
| Park Jie-won | Mokpo, South Jeolla Province | Independent | Democracy and Peace | |||||
| Lee Yong-ju | Yeosu A, South Jeolla Province | Independent | Democracy and Peace | |||||
| Jeong In-hwa | Gwangyang–Gokseong–Gurye, South Jeolla Province | Independent | Democracy and Peace | |||||
| Hwang Ju-hong | Goheung–Boseong–Jangheung–Gangjin, North Jeolla Province | Independent | Democracy and Peace | |||||
| Yoon Young-il | Haenam–Wando–Jindo, South Jeolla Province | Independent | Democracy and Peace | |||||
| Park Jun-yeong | Yeongam–Muan–Sinan, South Jeolla Province | Independent | Democracy and Peace | |||||
| 7 February 2018 | Son Kum-ju | Naju–Hwasun, South Jeolla Province | People | Independent | Left the People Party. | |||
| 11 February 2018 | Lee Yong-ho | Namwon–Imsil–Sunchang, North Jeolla Province | People | Independent | Left the People Party. | |||
| 13 February 2018 | 21 members | – | People | Bareunmirae | People Party merged into the Bareunmirae Party. | |||
| 9 members | – | Bareun | Bareunmirae | Bareun Party merged into the Bareunmirae Party. | ||||
| 6 May 2018 | Kang Ghil-boo | Ulju, Ulsan | Liberty Korea | Independent | Left the Liberty Korea Party. | |||
| 1 June 2018 | Chung Sye-kyun | Jongno, Seoul | Independent | Democratic | Returned to the Democratic Party after term as Speaker. | |||
| 10 June 2018 | Jeong Tae-ok | Buk A, Daegu | Liberty Korea | Independent | Left the Liberty Korea Party. | |||
| 20 June 2018 | Seo Chung-won | Hwaseong A, Gyeonggi Province | Liberty Korea | Independent | Left the Liberty Korea Party. | |||
| 13 July 2018 | Moon Hee-sang | Uijeongbu A, Gyeonggi Province | Democratic | Independent | Left the Democratic Party on election as Speaker of the National Assembly. | |||
| 18 December 2018 | Lee Hag-jae | Seo A, Incheon | Bareunmirae | Liberty Korea | Left the Bareunmirae Party to return to the Liberty Korea Party. | |||
| 21 January 2019 | Sohn Hye-won | Mapo B, Seoul | Democratic | Independent | Left the Democratic Party. | |||
| 22 January 2019 | Jeong Tae-ok | Buk A, Daegu | Independent | Liberty Korea | Returned to the Liberty Korea Party. | |||
| 23 April 2019 | Lee Un-ju | Gwangmyeong B, Gyeonggi Province | Bareunmirae | Independent | Left the Bareunmirae Party. | |||
| 17 June 2019 | Hong Mun-jong | Uijeongbu B, Gyonggi Province | Liberty Korea | Korean Patriot's | Left the Liberty Korea Party to join the Korean Patriot's Party. | |||
| 24 June 2019 | 2 members | – | Korean Patriot's | Our Republican | Korean Patriot's Party renamed as the Our Republican Party. | |||
| 16 August 2019 | Chang Byoung-wan | Dong–Nam A, Gwangju | Democracy and Peace | Independent | Left the Party for Democracy and Peace. | |||
| Chun Jung-bae | Seo B, Gwangju | Democracy and Peace | Independent | |||||
| Kim Gyeong-jin | Buk A, Gwangju | Democracy and Peace | Independent | |||||
| Choi Gyeong-hwan | Buk B, Gwangju | Democracy and Peace | Independent | |||||
| Yu Sung-yup | Jeongeup–Gochang, North Jeolla Province | Democracy and Peace | Independent | |||||
| Kim Jong-hee | Gimje–Buan, North Jeolla Province | Democracy and Peace | Independent | |||||
| Park Jie-won | Mokpo, South Jeolla Province | Democracy and Peace | Independent | |||||
| Lee Yong-ju | Yeosu A, South Jeolla Province | Democracy and Peace | Independent | |||||
| Jeong In-hwa | Gwangyang–Gokseong–Gurye, South Jeolla Province | Democracy and Peace | Independent | |||||
| Yoon Young-il | Haenam–Wando–Jindo, South Jeolla Province | Democracy and Peace | Independent | |||||
| 15 November 2019 | Son Kum-ju | Naju–Hwasun, South Jeolla Province | Independent | Democratic | Joined the Democratic Party. | |||
| 3 January 2020 | Ji Sang-wook | Jung–Seongdong B, Seoul | Bareunmirae | New Conservative | Left the Bareunmirae Party to form the New Conservative Party. | |||
| Oh Shin-hwan | Gwanak B, Seoul | Bareunmirae | New Conservative | |||||
| Lee Hye-hoon | Seocho A, Seoul | Bareunmirae | New Conservative | |||||
| Ha Tae-keung | Haeundae A, Busan | Bareunmirae | New Conservative | |||||
| Yoo Seong-min | Dong A, Daegu | Bareunmirae | New Conservative | |||||
| Yoo Eui-dong | Pyeongtaek B, Gyeonggi Province | Bareunmirae | New Conservative | |||||
| Choung Byoung-gug | Yeoju–Yangpyeong, Gyeonggi Province | Bareunmirae | New Conservative | |||||
| Chung Woon-chun | Jeonju B, North Jeolla Province | Bareunmirae | New Conservative | |||||
| 12 January 2020 | Chang Byoung-wan | Dong–Nam A, Gwangju | Independent | New Alternative | Formed the New Alternative Party. | |||
| Chun Jung-bae | Seo B, Gwangju | Independent | New Alternative | |||||
| Choi Gyeong-hwan | Buk B, Gwangju | Independent | New Alternative | |||||
| Yu Sung-yup | Jeongeup–Gochang, North Jeolla Province | Independent | New Alternative | |||||
| Kim Jong-hee | Gimje–Buan, North Jeolla Province | Independent | New Alternative | |||||
| Park Jie-won | Mokpo, South Jeolla Province | Independent | New Alternative | |||||
| Yoon Young-il | Haenam–Wando–Jindo, South Jeolla Province | Independent | New Alternative | |||||
| 19 January 2020 | Lee Un-ju | Gwangmyeong B, Gyeonggi Province | Independent | Onward for Future 4.0 | Formed Onward for Future 4.0. | |||
| 4 February 2020 | Lee Chan-yeol | Suwon A, Gyeonggi Province | Bareunmirae | Independent | Left the Bareunmirae Party. | |||
| 5 February 2020 | Kim Sung-shik | Gwanak A, Seoul | Bareunmirae | Independent | Left the Bareunmirae Party. | |||
| Kim Kwan-young | Gunsan, North Jeolla Province | Bareunmirae | Independent | |||||
| Han Sun-kyo | Yongin C, Gyeonggi Province | Liberty Korea | Future Korea | Joined the Future Korea Party, at that time a satellite party of the Liberty Korea Party. | ||||
| 6 February 2020 | Cho Hun-hyun | Proportional representation | Liberty Korea | Future Korea | Joined the Future Korea Party, at that time a satellite party of the Liberty Korea Party. | |||
| Lee Chan-yeol | Suwon A, Gyeonggi Province | Independent | Liberty Korea | Joined the Liberty Korea Party. | ||||
| 10 February 2020 | Hong Mun-jong | Uijeongbu B, Gyonggi Province | Our Republican | Independent | Removed from the Our Republican Party. | |||
| 13 February 2020 | Kim Sung-chan | Jinhae, Changwon, South Gyeongsang Province | Liberty Korea | Future Korea | Joined the Future Korea Party, at that time a satellite party of the Liberty Korea Party. | |||
| Lee Jong-myung | Proportional representation | Liberty Korea | Future Korea | |||||
| 14 February 2020 | Chung Woon-chun | Jeonju B, North Jeolla Province | New Conservative | Future Korea | Left the New Conservative Party to join the Future Korea Party, at that time a satellite party of the Liberty Korea Party. | |||
| 17 February 2020 | 105 members | – | Liberty Korea | United Future | Liberty Korea Party merged into the United Future Party. | |||
| 7 members | – | New Conservative | United Future | New Conservative Party merged into the United Future Party. | ||||
| Lee Un-ju | Gwangmyeong B, Gyeonggi Province | Onward for Future 4.0 | United Future | Onward for Future 4.0 merged into the United Future Party. | ||||
| 18 February 2020 | Shin Yong-hyeon | Proportional representation | Bareunmirae | Independent | Removed from the Bareunmirae Party. | |||
| Lee Sang-don | Proportional representation | Bareunmirae | Independent | |||||
| Kim Su-min | Proportional representation | Bareunmirae | Independent | |||||
| Lee Tae-gyu | Proportional representation | Bareunmirae | Independent | |||||
| Kim Sam-hwa | Proportional representation | Bareunmirae | Independent | |||||
| Lee Dong-seop | Proportional representation | Bareunmirae | Independent | |||||
| Lim Jae-hoon | Proportional representation | Bareunmirae | Independent | |||||
| Kim Jung-ro | Proportional representation | Bareunmirae | United Future | Left the Bareunmirae Party to join the United Future Party. | ||||
| 21 February 2020 | Gwon Eun-hui | Proportional representation | Bareunmirae | Independent | Left the Bareunmirae Party. | |||
| Lee Dong-seop | Proportional representation | Independent | United Future | Joined the United Future Party. | ||||
| 24 February 2020 | 8 members | – | Bareunmirae | Minsaeng | Bareunmirae Party merged into the Minsaeng Party. | |||
| 7 members | – | New Alternative | Minsaeng | New Alternative Party merged into the Minsaeng Party. | ||||
| 4 members | – | Democracy and Peace | Minsaeng | Party for Democracy and Peace merged into the Minsaeng Party. | ||||
| Lim Jae-hoon | Proportional representation | Independent | United Future | Joined the United Future Party. | ||||
| 25 February 2020 | Hong Mun-jong | Uijeongbu B, Gyonggi Province | Independent | PNP | Formed the Pro-Park New Party. | |||
| 27 February 2020 | Gwon Eun-hui | Gwangsan B, Gwangju | Independent | People (2020) | Joined the People Party (2020). | |||
| 28 February 2020 | Shin Yong-hyeon | Proportional representation | Independent | United Future | Joined the United Future Party. | |||
| Kim Su-min | Proportional representation | Independent | United Future | |||||
| Kim Sam-hwa | Proportional representation | Independent | United Future | |||||
| 1 March 2020 | Lee Tae-gyu | Proportional representation | Independent | People (2020) | Joined the People Party (2020). | |||
| 3 March 2020 | Cho Won-jin | Dalseo C, Daegu | Our Republican | Liberty Republican | Our Republican Party merged into the Liberty Republican Party. | |||
| Seo Chung-won | Hwaseong A, Gyeonggi Province | Independent | Liberty Republican | Joined the Our Republican Party (2020). | ||||
| 4 March 2020 | Yoon Sang-hyun | Nam B, Incheon | United Future | Independent | Left the United Future Party. | |||
| Lee Hyun-jae | Hanam, Gyeonggi Province | United Future | Independent | |||||
| 8 March 2020 | Sohn Hye-won | Mapo B, Seoul | Independent | Open Democratic | Formed the Open Democratic Party. | |||
| 9 March 2020 | Kim Jong-hee | Gimje–Buan, North Jeolla Province | Minsaeng | Independent | Left the Minsaeng Party. | |||
| 12 March 2020 | Kim Ki-sun | Wonju A, Gangwon Province | United Future | Future Korea | Joined the Future Korea Party, a satellite party of the United Future Party. | |||
| 13 March 2020 | Kwak Dae-hoon | Dalseo A, Daegu | United Future | Independent | Left the United Future Party. | |||
| 16 March 2020 | Shin Yong-hyeon | Proportional representation | United Future | Minsaeng | Removal from the Bareunmirae Party invalidated; included in the Minsaeng Party. | |||
| Kim Su-min | Proportional representation | United Future | Minsaeng | |||||
| Kim Sam-hwa | Proportional representation | United Future | Minsaeng | |||||
| Kim Jung-ro | Proportional representation | United Future | Minsaeng | |||||
| Lee Dong-seop | Proportional representation | United Future | Minsaeng | |||||
| Lim Jae-hoon | Proportional representation | United Future | Minsaeng | |||||
| Lee Tae-gyu | Proportional representation | People (2020) | Minsaeng | |||||
| Lee Sang-don | Proportional representation | Independent | Minsaeng | |||||
| Kweon Seong-dong | Gangneung, Gangwon Province | United Future | Independent | Left the United Future Party. | ||||
| 18 March 2020 | Jeong Tae-ok | Buk A, Daegu | United Future | Independent | Left the United Future Party. | |||
| 19 March 2020 | Jeong Kab-yoon | Jung, Ulsan | United Future | Future Korea | Joined the Future Korea Party, a satellite party of the United Future Party. | |||
| Won Yoo-chul | Pyeongtaek A, Gyeonggi Province | United Future | Future Korea | |||||
| Yeom Dong-yeol | Taebaek–Hoengseong–Yeongwol–Pyeongchang–Jeongseon, Gangwon Province | United Future | Future Korea | |||||
| Chang Seok-chun | Gumi B, North Gyeongsang Province | United Future | Future Korea | |||||
| Min Byung-doo | Dongdaemun B, Seoul | Democratic | Independent | Left the Democratic Party. | ||||
| 23 March 2020 | Lee Eun-jae | Gangnam C, Seoul | United Future | Christian Liberal Unification | Left the United Future Party to join the Christian Liberal Unification Party. | |||
| 2 members | – | Liberty Republican Party | Our Republican | Liberty Republican Party renamed as the Our Republican Party. | ||||
| 25 March 2020 | Lee Hoon | Geumcheon, Seoul | Democratic | Platform | Joined the Platform Party, a satellite party of the Democratic Party. | |||
| Lee Jong-kul | Manan, Anyang, Gyeonggi Province | Democratic | Platform | |||||
| Sim Chang-hyeon | Uiwang–Gwacheon, Gyeonggi Province | Democratic | Platform | |||||
| Lee Gyu-hee | Cheonan A, South Chungcheong Province | Democratic | Platform | |||||
| Je Youn-kyung | Proportional representation | Democratic | Platform | |||||
| Shim Gi-jun | Proportional representation | Democratic | Platform | |||||
| Jung Eun-hye | Proportional representation | Democratic | Platform | |||||
| 26 March 2020 | Song Hee-kyung | Proportional representation | United Future | Future Korea | Joined the Future Korea Party, a satellite party of the United Future Party. | |||
| Moon Jin-guk | Proportional representation | United Future | Future Korea | |||||
| Kim Gyu-hwan | Proportional representation | United Future | Future Korea | |||||
| Kim Jong-suk | Proportional representation | United Future | Future Korea | |||||
| Kim Seung-hee | Proportional representation | United Future | Future Korea | |||||
| Yun Jong-pil | Proportional representation | United Future | Future Korea | |||||
| Kim Sun-rye | Proportional representation | United Future | Future Korea | |||||
| Kim Gwang-su | Jeonju A, North Jeolla Province | Minsaeng | Independent | Left the Minsaeng Party. | ||||
| Lee Eun-jae | Gangnam C, Seoul | Christian Liberal Unification | Independent | Removed from the Christian Liberal Unification Party. | ||||
| 27 March 2020 | Yun Il-gyu | Cheonan C, South Chungcheong Province | Democratic | Platform | Joined the Platform Party, a satellite party of the Democratic Party. | |||
| Lee Eun-jae | Gangnam C, Seoul | Independent | Korea Economic | Joined the Korea Economic Party. | ||||
| 30 March 2020 | Yeo Sang-gyu | Sacheon–Namhae–Hadong, South Gyeongsang Province | United Future | Future Korea | Joined the Future Korea Party, a satellite party of the United Future Party. | |||
| Park Maeng-woo | Nam B, Ulsan | United Future | Future Korea | |||||
| Baek Seung-joo | Gumi A, North Gyeongsang Province | United Future | Future Korea | |||||
| 27 April 2020 | Lee Eun-jae | Gangnam C, Seoul | Korea Economic | Independent | Left the Korea Economic Party | |||