| 4. Jornada | 13.03.2021 | Pohang Steelers | - | Ulsan Hyundai FC | 1:1 | ||||
| 6. Jornada | 21.03.2021 | Daegu FC | - | Ulsan Hyundai FC | 2:1 | ||||
| 12. Jornada | 25.04.2021 | Incheon United | - | Ulsan Hyundai FC | 0:0 | ||||
| 13. Jornada | 01.05.2021 | Ulsan Hyundai FC | - | Gwangju FC | 2:0 | ||||
| 15. Jornada | 12.05.2021 | Gangwon FC | - | Ulsan Hyundai FC | 2:2 | ||||
| 17. Jornada | 19.05.2021 | Jeonbuk FC | - | Ulsan Hyundai FC | 2:4 | ||||
| 18. Jornada | 22.05.2021 | Ulsan Hyundai FC | - | Pohang Steelers | 1:0 | ||||
| 19. Jornada | 29.05.2021 | Jeju United | - | Ulsan Hyundai FC | 1:2 | ||||
| 14. Jornada | 20.06.2021 | Ulsan Hyundai FC | - | Seongnam FC | 2:2 | ||||
| 21. Jornada | 25.07.2021 | Ulsan Hyundai FC | - | Suwon FC | 2:5 | ||||
| 22. Jornada | 31.07.2021 | FC Seoul | - | Ulsan Hyundai FC | 0:0 | ||||
| 20. Jornada | 04.08.2021 | Ulsan Hyundai FC | - | Daegu FC | 2:1 | ||||
| 25. Jornada | 14.08.2021 | Jeju United | - | Ulsan Hyundai FC | 2:2 | ||||
| 26. Jornada | 22.08.2021 | Ulsan Hyundai FC | - | Suwon Bluewings | 3:1 |  |
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| 28. Jornada | 29.08.2021 | Ulsan Hyundai FC | - | Incheon United | 3:2 |
Corea del Sur