| K League 1 2020 - Appearances as Assistant | ||||
| 22/08/2020 | Incheon United | - | Suwon Bluewings | 1:0 |
| 16/09/2020 | Busan IPark | - | Gangwon FC | 1:2 |
| K League 1 2020 - Appearances as Assistant | ||||
| 22/08/2020 | Incheon United | - | Suwon Bluewings | 1:0 |
| 16/09/2020 | Busan IPark | - | Gangwon FC | 1:2 |
| Complete name: | Joo-kyung Sung |
| Born: | |
| Place of birth: |
South Korea |
| Nationality: |
South Korea |