| 3. Ronde | 10.03.2021 | Seongnam FC | - | FC Seoul | 1:0 | ||||
| 4. Ronde | 14.03.2021 | Suwon FC | - | Seongnam FC | 1:2 | ||||
| 5. Ronde | 17.03.2021 | Gangwon FC | - | Seongnam FC | 0:0 | ||||
| 8. Ronde | 06.04.2021 | Daegu FC | - | Seongnam FC | 0:0 | ||||
| 12. Ronde | 25.04.2021 | Seongnam FC | - | Suwon Bluewings | 0:1 |  |
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| 13. Ronde | 30.04.2021 | FC Seoul | - | Seongnam FC | 2:2 | ||||
| 19. Ronde | 29.05.2021 | Seongnam FC | - | Suwon FC | 2:3 | ||||
| 17. Ronde | 26.06.2021 | Seongnam FC | - | Gangwon FC | 1:2 | ||||
| 22. Ronde | 01.08.2021 | Gwangju FC | - | Seongnam FC | 0:0 | |
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| 16. Ronde | 04.08.2021 | Pohang Steelers | - | Seongnam FC | 1:0 | ||||
| 23. Ronde | 07.08.2021 | Seongnam FC | - | Pohang Steelers | 1:0 | ||||
| 25. Ronde | 14.08.2021 | Suwon Bluewings | - | Seongnam FC | 1:2 | |
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| 20. Ronde | 18.08.2021 | Incheon United | - | Seongnam FC | 1:0 | ||||
| 28. Ronde | 28.08.2021 | Daegu FC | - | Seongnam FC | 3:1 | ||||
| 21. Ronde | 04.09.2021 | Seongnam FC | - | Daegu FC | 0:0 | |
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| 29. Ronde | 12.09.2021 | Seongnam FC | - | FC Seoul | 1:1 | |
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| 31. Ronde | 22.09.2021 | Suwon FC | - | Seongnam FC | 3:1 | ||||
| 32. Ronde | 26.09.2021 | Seongnam FC | - | Gangwon FC | 2:0 | ||||
| 33. Ronde | 03.10.2021 | Jeju United | - | Seongnam FC | 2:1 |
Zuid-Korea