| 1. Jornada | 01.03.2021 | Seongnam FC | - | Jeju United | 0:0 | ||||
| 2. Jornada | 06.03.2021 | Jeju United | - | Jeonbuk FC | 1:1 | ||||
| 3. Jornada | 09.03.2021 | Jeju United | - | Pohang Steelers | 1:0 | ||||
| 4. Jornada | 13.03.2021 | Daegu FC | - | Jeju United | 1:1 | ||||
| 8. Jornada | 07.04.2021 | Jeju United | - | Gangwon FC | 1:1 | ||||
| 9. Jornada | 11.04.2021 | Jeju United | - | Suwon Bluewings | 2:1 | ||||
| 10. Jornada | 17.04.2021 | Incheon United | - | Jeju United | 0:3 | ||||
| 11. Jornada | 21.04.2021 | Jeju United | - | FC Seoul | 2:1 |  |
|||
| 12. Jornada | 24.04.2021 | Pohang Steelers | - | Jeju United | 0:0 | ||||
| 15. Jornada | 12.05.2021 | Suwon Bluewings | - | Jeju United | 3:2 | ||||
| 18. Jornada | 22.05.2021 | Jeju United | - | Seongnam FC | 2:2 | ||||
| 29. Jornada | 11.09.2021 | Incheon United | - | Jeju United | 1:2 | ||||
| 32. Jornada | 25.09.2021 | Pohang Steelers | - | Jeju United | 2:4 | ||||
| 33. Jornada | 03.10.2021 | Jeju United | - | Seongnam FC | 2:1 |  |
|||
| 27. Jornada | 10.10.2021 | Gangwon FC | - | Jeju United | 2:2 | |
|||
| 24. Jornada | 24.10.2021 | Jeju United | - | Jeonbuk FC | 2:2 |
Corea del Sur