| Competition: | KEB Hana Bank K League 2 |
| Season: | 2018 |
| Winners: | Asan Mugunghwa (1st title) |
| Promoted: | Seongnam FC |
| Best Player: | Na Sang-ho[1] |
| League Topscorer: | Na Sang-ho (16 goals) |
| Matches: | 180 |
| Total Goals: | 426 |
| Biggest Home Win: | Gwangju 5–0 Suwon FC (21 April 2018) |
| Biggest Away Win: | Seoul E 0–5 Busan (11 August 2018) |
| Highest Scoring: | Busan 4–3 Anyang (29 July 2018) |
| Highest Attendance: | 6,532 Busan 2–2 Gwangju (4 November 2018) |
| Lowest Attendance: | 312 Seoul E 1–0 Anyang (14 April 2018) |
| Average Attendance: | 1,672 |
| Prevseason: | 2017 |
| Nextseason: | 2019 |
The 2018 K League 2 was the sixth season of the K League 2, the second-highest division in the South Korean football league system.[2]
Asan Mugunghwa once again grabbed an opportunity for promotion by winning its second K League 2 title (officially first title after Ansan era), but its owner Korean Police Agency did not recruit new players who could meet clubs' requisite for maintenance before the end of the season. Asan Mugunghwa, which was in the process of being dissolved, was finally disqualified from promoting.
Runners-up Seongnam FC directly qualified for the K League 1 instead of Asan Mugunghwa, and the third, fourth, and fifth-placed team advanced to the promotion playoffs.
Relegated from K League Classic
Promoted to K League 1
| Ansan Greeners | FC Anyang | Asan Mugunghwa | Bucheon FC 1995 | Busan IPark | |
|---|---|---|---|---|---|
| Ansan Wa~ Stadium | Anyang Stadium | Yi Sun-sin Stadium | Bucheon Stadium | Busan Gudeok Stadium | |
| Capacity: 35,000 | Capacity: 17,143 | Capacity: 19,283 | Capacity: 34,545 | Capacity: 12,349 | |
| Daejeon Citizen | Gwangju FC | Seongnam FC | Seoul E-Land | Suwon FC | |
| Daejeon World Cup Stadium | Gwangju World Cup Stadium | Tancheon Stadium | Seoul Olympic Stadium | Suwon Sports Complex | |
| Capacity: 40,535 | Capacity: 40,245 | Capacity: 16,146 | Capacity: 69,950 | Capacity: 11,808 | |
Note: Flags indicate national team as has been defined under FIFA eligibility rules. Players may hold more than one non-FIFA nationality.
Restricting the number of foreign players strictly to four per team, including a slot for a player from AFC countries. A team could use four foreign players on the field each game.
As of 24 July 2018.
The promotion-relegation playoffs were held between the winners of the 2018 K League 2 playoffs and the 11th-placed club of the 2018 K League 1. The winners on aggregate score after both matches earned entry into the 2019 K League 1.
-----FC Seoul won 4–2 on aggregate and therefore both clubs remain in their respective leagues.
| Rank | Player | Club | Goals | ||
|---|---|---|---|---|---|
| 1 |  Na Sang-ho | Gwangju FC | 16 | ||
| 2 |  Wesley Alex | FC Anyang | 15 | ||
| 3 | Aurelian Chițu | Daejeon Citizen | 11 | ||
| align=center rowspan=2 | 4 | Jung Sung-min | Seongnam FC | align=center rowspan=2 | 10 |
| Willian Popp | Bucheon FC 1995 | ||||
| align=center rowspan=2 | 6 | Ko Kyung-min | Busan IPark | align=center rowspan=2 | 9 |
| Rômulo | Busan IPark | ||||
| 8 |  Shohrux Gadoyev | Daejeon Citizen | 8 | ||
| 9 | align=center colspan=2 | 7 players | 7 |
| Rank | Player | Club | Assists | ||
|---|---|---|---|---|---|
| 1 | Rômulo | Busan IPark | 9 | ||
| align=center rowspan=2 | 2 | Park Soo-il | Daejeon Citizen | align=center rowspan=2 | 8 |
| Chang Hyuk-jin | Ansan Greeners | ||||
| 4 | Moon Sang-yun | Seongnam FC | 7 | ||
| 5 | Jo Seong-joon | Asan Mugunghwa | 6 | ||
| align=center rowspan=6 | 6 | Lee Euddeum | Asan Mugunghwa | align=center rowspan=6 | 6 |
| Cho Chan-ho | Seoul E-Land | ||||
| Lee Jae-kwon | Busan IPark | ||||
| Lee Myung-joo | Asan Mugunghwa | ||||
| Moon Ki-han | Bucheon FC 1995 | ||||
| Kim Dong-hyun | Gwangju FC |
Attendants who entered with free ticket were not counted.
