| K League 1 2021 Relegation - Appearances as Referee |  |
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 |
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| 30/10/2021 | Seongnam FC | - | Pohang Steelers | 1:0 | 3 | - | - |
| K League 1 2021 Relegation - Appearances as Referee | |
|
|
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| 30/10/2021 | Seongnam FC | - | Pohang Steelers | 1:0 | 3 | - | - |
| Complete name: | Hyung-jin Ko |
| Born: | 20/06/1982 |
| Place of birth: |
South Korea |
| Nationality: |
South Korea |