| 1. Ronde | 27.02.2021 | Jeonbuk FC | - | FC Seoul | 2:0 | ||||
| 3. Ronde | 10.03.2021 | Seongnam FC | - | FC Seoul | 1:0 | ||||
| 4. Ronde | 13.03.2021 | Incheon United | - | FC Seoul | 0:1 | ||||
| 5. Ronde | 17.03.2021 | FC Seoul | - | Gwangju FC | 2:1 | ||||
| 8. Ronde | 07.04.2021 | Ulsan Hyundai FC | - | FC Seoul | 3:2 | ||||
| 9. Ronde | 10.04.2021 | FC Seoul | - | Pohang Steelers | 1:2 |  |
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| 10. Ronde | 17.04.2021 | FC Seoul | - | Daegu FC | 0:1 | ||||
| 19. Ronde | 29.05.2021 | FC Seoul | - | Suwon Bluewings | 0:3 | ||||
| 15. Ronde | 06.06.2021 | Daegu FC | - | FC Seoul | 1:1 | ||||
| 14. Ronde | 19.06.2021 | Gwangju FC | - | FC Seoul | 1:1 | ||||
| 25. Ronde | 15.08.2021 | Jeonbuk FC | - | FC Seoul | 3:2 | ||||
| 20. Ronde | 18.08.2021 | FC Seoul | - | Jeju United | 0:1 | ||||
| 26. Ronde | 22.08.2021 | FC Seoul | - | Pohang Steelers | 2:2 | ||||
| 27. Ronde | 25.08.2021 | FC Seoul | - | Ulsan Hyundai FC | 1:2 | ||||
| 28. Ronde | 29.08.2021 | Jeju United | - | FC Seoul | 1:0 |
Zuid-Korea