Additions
| from | Name | Pos | Team | Team | ||
|---|---|---|---|---|---|---|
| 11/2021 |  | Jeong-bin Lee | MF |  | Gimcheon Sangmu | Gimcheon Sangmu |
| 06/2021 | | Tae-jun Park | MF |  | Seongnam FC | Seongnam FC |
| 02/2021 | | Jae-hyeon Mo | MF |  | Suwon FC | Suwon FC |
| 01/2021 | | Sun-young Lim | FW | |||
| 01/2021 | | Jun-yeon Jeong | DF |  | Gwangju FC | Gwangju FC |
| 01/2021 | | Dong-gyu Baek | DF |  | Jeju SK FC | Jeju SK FC |
| 01/2021 | | Seung-un Ha | FW |  | Pohang Steelers | Pohang Steelers |
| 01/2021 | | Kyung-jung Kim | MF |  | Gangwon FC | Gangwon FC |
| 01/2021 | | Dong-woon Shim | FW | | Pohang Steelers | Pohang Steelers |
| 01/2021 | | Min-seo Choi | FW | | Pohang Steelers | Pohang Steelers |
| 01/2021 | | Seung-kyum Im | DF | | Seongnam FC | Seongnam FC |
| 01/2021 | | Chang-beom Hong | MF |  | Sungkyunkwan University | Sungkyunkwan University |
| 01/2021 | | Dae-han Park | DF |  | Incheon United | Incheon United |
| 01/2021 |  | Jonathan Moya | FW |
Departures
| from | Name | Pos | Team | Team | ||
|---|---|---|---|---|---|---|
| 07/2021 | | Bon-Hyeok Koo | MF |  | Chungju Citizen FC | Chungju Citizen FC |
| 07/2021 | | Dong-su Kim | DF |  | Hoàng Anh Gia Lai | Hoàng Anh Gia Lai |
| 06/2021 | | Ho-jung Choi | MF |  | Jeonnam Dragons | Jeonnam Dragons |
| 01/2021 | | Yo-Han Park | DF | | Suwon FC | Suwon FC |
| 01/2021 | | Mun-ki Hwang | MF | | Gangwon FC | Gangwon FC |
| 01/2021 | | Ki-pyo Kwon | MF | | Pohang Steelers | Pohang Steelers |
| 01/2021 | | Gyeong-min Kim | FW | | Jeonnam Dragons | Jeonnam Dragons |