| 1. Jornada | 27.02.2021 | Jeonbuk FC | - | FC Seoul | 2:0 | ||||
| 2. Jornada | 07.03.2021 | FC Seoul | - | Suwon FC | 3:0 | ||||
| 3. Jornada | 10.03.2021 | Seongnam FC | - | FC Seoul | 1:0 | ||||
| 4. Jornada | 13.03.2021 | Incheon United | - | FC Seoul | 0:1 | ||||
| 5. Jornada | 17.03.2021 | FC Seoul | - | Gwangju FC | 2:1 | ||||
| 6. Jornada | 21.03.2021 | Suwon Bluewings | - | FC Seoul | 1:2 |  |
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| 7. Jornada | 03.04.2021 | FC Seoul | - | Gangwon FC | 0:1 | ||||
| 9. Jornada | 10.04.2021 | FC Seoul | - | Pohang Steelers | 1:2 | ||||
| 10. Jornada | 17.04.2021 | FC Seoul | - | Daegu FC | 0:1 | ||||
| 17. Jornada | 14.07.2021 | FC Seoul | - | Incheon United | 0:1 | ||||
| 21. Jornada | 24.07.2021 | Pohang Steelers | - | FC Seoul | 0:1 | |
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| 22. Jornada | 31.07.2021 | FC Seoul | - | Ulsan Hyundai FC | 0:0 | ||||
| 23. Jornada | 08.08.2021 | FC Seoul | - | Gwangju FC | 1:0 | ||||
| 25. Jornada | 15.08.2021 | Jeonbuk FC | - | FC Seoul | 3:2 | ||||
| 26. Jornada | 22.08.2021 | FC Seoul | - | Pohang Steelers | 2:2 | ||||
| 27. Jornada | 25.08.2021 | FC Seoul | - | Ulsan Hyundai FC | 1:2 | ||||
| 28. Jornada | 29.08.2021 | Jeju United | - | FC Seoul | 1:0 | ||||
| 33. Jornada | 03.10.2021 | FC Seoul | - | Daegu FC | 1:1 |  |
Corea del Sur