| 4. Jornada | 14.03.2021 | Suwon FC | - | Seongnam FC | 1:2 |  |
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| 5. Jornada | 17.03.2021 | Gangwon FC | - | Seongnam FC | 0:0 | ||||
| 6. Jornada | 21.03.2021 | Seongnam FC | - | Pohang Steelers | 2:1 | ||||
| 7. Jornada | 03.04.2021 | Seongnam FC | - | Ulsan Hyundai FC | 0:1 | ||||
| 8. Jornada | 06.04.2021 | Daegu FC | - | Seongnam FC | 0:0 | ||||
| 9. Jornada | 10.04.2021 | Seongnam FC | - | Gwangju FC | 2:0 | ||||
| 10. Jornada | 18.04.2021 | Jeonbuk FC | - | Seongnam FC | 1:0 | ||||
| 11. Jornada | 21.04.2021 | Seongnam FC | - | Incheon United | 1:3 | ||||
| 12. Jornada | 25.04.2021 | Seongnam FC | - | Suwon Bluewings | 0:1 | ||||
| 14. Jornada | 20.06.2021 | Ulsan Hyundai FC | - | Seongnam FC | 2:2 | ||||
| 17. Jornada | 26.06.2021 | Seongnam FC | - | Gangwon FC | 1:2 | ||||
| 16. Jornada | 04.08.2021 | Pohang Steelers | - | Seongnam FC | 1:0 | ||||
| 20. Jornada | 18.08.2021 | Incheon United | - | Seongnam FC | 1:0 | ||||
| 28. Jornada | 28.08.2021 | Daegu FC | - | Seongnam FC | 3:1 | ||||
| 21. Jornada | 04.09.2021 | Seongnam FC | - | Daegu FC | 0:0 | ||||
| 29. Jornada | 12.09.2021 | Seongnam FC | - | FC Seoul | 1:1 | ||||
| 30. Jornada | 19.09.2021 | Incheon United | - | Seongnam FC | 0:1 |
Rumania