| K League 1 2020 Relegation - Appearances as Referee |  |
 |
 |
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| 04/10/2020 | Incheon United | - | Suwon Bluewings | 0:1 | 6 | - | - |
| 23/10/2020 | Suwon Bluewings | - | Seongnam FC | 1:2 | 2 | - | - |
| 31/10/2020 | FC Seoul | - | Incheon United | 0:1 | 8 | 1 | 1 |
| K League 1 2020 Relegation - Appearances as Referee | |
|
|
||||
| 04/10/2020 | Incheon United | - | Suwon Bluewings | 0:1 | 6 | - | - |
| 23/10/2020 | Suwon Bluewings | - | Seongnam FC | 1:2 | 2 | - | - |
| 31/10/2020 | FC Seoul | - | Incheon United | 0:1 | 8 | 1 | 1 |
| Complete name: | Woo-sung Kim |
| Born: | 28/05/1987 |
| Place of birth: |
South Korea |
| Nationality: |
South Korea |