| Relegation 2021 - Appearances as Referee |  |
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| 08/12/2021 | Daejeon Hana Citizen | - | Gangwon FC | 1:0 | 4 | - | - |
| Relegation 2021 - Appearances as Referee | |
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| 08/12/2021 | Daejeon Hana Citizen | - | Gangwon FC | 1:0 | 4 | - | - |
| Complete name: | Hyung-jin Ko |
| Born: | 20/06/1982 |
| Place of birth: |
South Korea |
| Nationality: |
South Korea |