| 1. Round | 10/05/2020 | Gangwon FC | - | FC Seoul | 3:1 | ||||
| 2. Round | 17/05/2020 | FC Seoul | - | Gwangju FC | 1:0 | ||||
| 3. Round | 22/05/2020 | Pohang Steelers | - | FC Seoul | 1:2 | ||||
| 4. Round | 31/05/2020 | FC Seoul | - | Seongnam FC | 0:1 | ||||
| 5. Round | 06/06/2020 | FC Seoul | - | Jeonbuk FC | 1:4 | ||||
| 6. Round | 14/06/2020 | Daegu FC | - | FC Seoul | 6:0 | ||||
| 7. Round | 17/06/2020 | Sangju Sangmu | - | FC Seoul | 1:0 | ||||
| 8. Round | 20/06/2020 | FC Seoul | - | Ulsan Hyundai FC | 0:2 | ||||
| 9. Round | 27/06/2020 | FC Seoul | - | Incheon United | 1:0 | ||||
| 10. Round | 04/07/2020 | Suwon Bluewings | - | FC Seoul | 3:3 | ||||
| 11. Round | 10/07/2020 | Busan IPark | - | FC Seoul | 2:0 | ||||
| 12. Round | 18/07/2020 | FC Seoul | - | Pohang Steelers | 1:3 | ||||
| 13. Round | 26/07/2020 | Jeonbuk FC | - | FC Seoul | 3:0 | ||||
| 14. Round | 01/08/2020 | Seongnam FC | - | FC Seoul | 1:2 | ||||
| 15. Round | 07/08/2020 | FC Seoul | - | Gangwon FC | 2:0 | ||||
| 16. Round | 15/08/2020 | FC Seoul | - | Sangju Sangmu | 2:1 | ||||
| 17. Round | 22/08/2020 | Gwangju FC | - | FC Seoul | 0:0 | ||||
| 19. Round | 05/09/2020 | FC Seoul | - | Busan IPark | 1:1 | ||||
| 20. Round | 13/09/2020 | FC Seoul | - | Suwon Bluewings | 2:1 |  |
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| 21. Round | 16/09/2020 | Incheon United | - | FC Seoul | 1:0 |
South Korea