| K League 1 2020 Championship - Appearances as Assistant | ||||
| 27/09/2020 | Pohang Steelers | - | Gwangju FC | 5:3 |
| 18/10/2020 | Jeonbuk FC | - | Gwangju FC | 4:1 |
| 01/11/2020 | Pohang Steelers | - | Sangju Sangmu | 3:1 |
| K League 1 2020 Championship - Appearances as Assistant | ||||
| 27/09/2020 | Pohang Steelers | - | Gwangju FC | 5:3 |
| 18/10/2020 | Jeonbuk FC | - | Gwangju FC | 4:1 |
| 01/11/2020 | Pohang Steelers | - | Sangju Sangmu | 3:1 |
| Complete name: | Eun-seok Gu |
| Born: | |
| Place of birth: |
South Korea |
| Nationality: |
South Korea |