| K League 1 2020 Relegation - Appearances as Referee |  |
 |
 |
||||
| 27/09/2020 | Seongnam FC | - | Incheon United | 0:6 | 1 | - | 1 |
| 24/10/2020 | Incheon United | - | Busan IPark | 2:1 | 3 | - | - |
| 31/10/2020 | Gangwon FC | - | Suwon Bluewings | 1:2 | 5 | - | - |
| K League 1 2020 Relegation - Appearances as Referee | |
|
|
||||
| 27/09/2020 | Seongnam FC | - | Incheon United | 0:6 | 1 | - | 1 |
| 24/10/2020 | Incheon United | - | Busan IPark | 2:1 | 3 | - | - |
| 31/10/2020 | Gangwon FC | - | Suwon Bluewings | 1:2 | 5 | - | - |
| Complete name: | Ji-um Cho |
| Born: | |
| Place of birth: |
South Korea |
| Nationality: |
South Korea |