| K League 1 2021 Championship - Appearances as Assistant | ||||
| 31/10/2021 | Daegu FC | - | Jeju United | 0:5 |
| 21/11/2021 | Suwon FC | - | Jeonbuk FC | 3:2 |
| 05/12/2021 | Suwon FC | - | Suwon Bluewings | 2:0 |
| K League 1 2021 Championship - Appearances as Assistant | ||||
| 31/10/2021 | Daegu FC | - | Jeju United | 0:5 |
| 21/11/2021 | Suwon FC | - | Jeonbuk FC | 3:2 |
| 05/12/2021 | Suwon FC | - | Suwon Bluewings | 2:0 |
| Complete name: | Joo-kyung Sung |
| Born: | |
| Place of birth: |
South Korea |
| Nationality: |
South Korea |