| K League 1 2018 Relegation - Appearances as Referee |  |
 |
 |
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| 27/10/2018 | FC Seoul | - | Gangwon FC | 1:1 | 3 | - | - |
| 03/11/2018 | Incheon United | - | Sangju Sangmu | 2:1 | 3 | - | - |
| 24/11/2018 | Sangju Sangmu | - | Gangwon FC | 0:1 | 4 | - | - |
| K League 1 2018 Relegation - Appearances as Referee | |
|
|
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| 27/10/2018 | FC Seoul | - | Gangwon FC | 1:1 | 3 | - | - |
| 03/11/2018 | Incheon United | - | Sangju Sangmu | 2:1 | 3 | - | - |
| 24/11/2018 | Sangju Sangmu | - | Gangwon FC | 0:1 | 4 | - | - |
| Complete name: | Woo-sung Kim |
| Born: | 28/05/1987 |
| Place of birth: |
South Korea |
| Nationality: |
South Korea |