| K League 1 2023 Championship - Appearances as Assistant | ||||
| 21/10/2023 | Gwangju FC | - | Ulsan Hyundai FC | 1:0 |
| 12/11/2023 | Ulsan Hyundai FC | - | Pohang Steelers | 3:2 |
| K League 1 2023 Championship - Appearances as Assistant | ||||
| 21/10/2023 | Gwangju FC | - | Ulsan Hyundai FC | 1:0 |
| 12/11/2023 | Ulsan Hyundai FC | - | Pohang Steelers | 3:2 |
| Complete name: | Joo-kyung Sung |
| Born: | |
| Place of birth: |
South Korea |
| Nationality: |
South Korea |