| 1. Round | 10/05/2020 | Gangwon FC | - | FC Seoul | 3:1 |  |
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| 2. Round | 17/05/2020 | FC Seoul | - | Gwangju FC | 1:0 | ||||
| 3. Round | 22/05/2020 | Pohang Steelers | - | FC Seoul | 1:2 |  |
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| 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 | ||||
| 20. Round | 13/09/2020 | FC Seoul | - | Suwon Bluewings | 2:1 | ||||
| 21. Round | 16/09/2020 | Incheon United | - | FC Seoul | 1:0 | ||||
| 22. Round | 20/09/2020 | FC Seoul | - | Daegu FC | 0:0 |
Spain