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| 14/04/2021 | 11:00 | Pocheon FC | - | Yangju Citizen | 0:2 (0:0) | |
| 11:00 | Daejeon Hana Citizen | - | Suwon Bluewings | 1:2 (1:1) | ||
| 11:00 | Incheon United | - | FC Anyang | 0:3 (0:1) | ||
| 11:00 | Gimhae FC | - | Bucheon FC 1995 | 4:3 (0:0, 1:1, 1:1) pso | ||
| 11:00 | Gimcheon Sangmu | - | Jeju United | 1:0 (0:0) | ||
| 11:00 | Seongnam FC | - | Busan IPark | 1:0 (1:0) | ||
| 11:00 | Ansan Greeners | - | Chungnam Asan FC | 0:1 (0:0) | ||
| 11:00 | Cheongju FC | - | Gangwon FC | 1:2 (0:0) | ||
| 11:00 | Gyeongnam FC | - | FC Mokpo | 3:1 (0:0, 1:1) aet | ||
| 11:00 | Busan Transportation Corporation | - | Gwangju FC | 5:3 (0:0, 2:2, 2:2) pso | ||
| 11:00 | Suwon FC | - | Jeonnam Dragons | 4:5 (0:1, 1:1, 1:1) pso | ||
| 11:30 | FC Seoul | - | Seoul E-Land FC | 0:1 (0:0) |
