| 17. Jornada | 19.05.2021 | Gwangju FC | - | Jeju United | 0:0 |  |
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| 18. Jornada | 22.05.2021 | Jeju United | - | Seongnam FC | 2:2 | ||||
| 19. Jornada | 29.05.2021 | Jeju United | - | Ulsan Hyundai FC | 1:2 | ||||
| 22. Jornada | 31.07.2021 | Jeju United | - | Incheon United | 1:4 | ||||
| 23. Jornada | 07.08.2021 | Suwon Bluewings | - | Jeju United | 0:0 | ||||
| 25. Jornada | 14.08.2021 | Jeju United | - | Ulsan Hyundai FC | 2:2 | |
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| 20. Jornada | 18.08.2021 | FC Seoul | - | Jeju United | 0:1 | ||||
| 26. Jornada | 21.08.2021 | Suwon FC | - | Jeju United | 1:0 | ||||
| 28. Jornada | 29.08.2021 | Jeju United | - | FC Seoul | 1:0 | ||||
| 29. Jornada | 11.09.2021 | Incheon United | - | Jeju United | 1:2 | ||||
| 30. Jornada | 18.09.2021 | Gwangju FC | - | Jeju United | 0:3 | ||||
| 31. Jornada | 22.09.2021 | Jeju United | - | Daegu FC | 0:1 | ||||
| 32. Jornada | 25.09.2021 | Pohang Steelers | - | Jeju United | 2:4 |  |
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| 33. Jornada | 03.10.2021 | Jeju United | - | Seongnam FC | 2:1 | ||||
| 27. Jornada | 10.10.2021 | Gangwon FC | - | Jeju United | 2:2 |
Corea del Sur