| K League 1 2017 Relegation - Appearances as Referee |  |
 |
 |
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| 21/10/2017 | Jeonnam Dragons | - | Pohang Steelers | 1:3 | 4 | - | - |
| 04/11/2017 | Daegu FC | - | Gwangju FC | 2:0 | 4 | - | - |
| 18/11/2017 | Incheon United | - | Sangju Sangmu | 2:0 | 4 | - | 1 |
| K League 1 2017 Relegation - Appearances as Referee | |
|
|
||||
| 21/10/2017 | Jeonnam Dragons | - | Pohang Steelers | 1:3 | 4 | - | - |
| 04/11/2017 | Daegu FC | - | Gwangju FC | 2:0 | 4 | - | - |
| 18/11/2017 | Incheon United | - | Sangju Sangmu | 2:0 | 4 | - | 1 |
| Complete name: | Hyung-jin Ko |
| Born: | |
| Place of birth: |
South Korea |
| Nationality: |
South Korea |