| K League 1 2023 Relegation - Appearances as Assistant | ||||
| 29/10/2023 | Suwon FC | - | FC Seoul | 3:4 |
| 25/11/2023 | Gangwon FC | - | Suwon FC | 2:0 |
| 02/12/2023 | Daejeon Hana Citizen | - | FC Seoul | 2:2 |
| K League 1 2023 Relegation - Appearances as Assistant | ||||
| 29/10/2023 | Suwon FC | - | FC Seoul | 3:4 |
| 25/11/2023 | Gangwon FC | - | Suwon FC | 2:0 |
| 02/12/2023 | Daejeon Hana Citizen | - | FC Seoul | 2:2 |
| Complete name: | Joo-kyung Sung |
| Born: | |
| Place of birth: |
South Korea |
| Nationality: |
South Korea |