| 2018/03/28 | Yangpyeong |  | 2-1
Pro. |  | Siheung Citizen | | | | |
| | Ulsan Hyundai |  | 1-3
Pro. |  | Gyeongju KHNP | | | | |
| | Asan Mugunghwa |  | 7-0 |  | Yeoju Citizen | | | | |
| | Chuncheon |  | 3-2 |  | Jeonju | | | | |
| | Cheonan |  | 3-2 |  | Jeonju University | | | | |
| | Busan Kyotong |  | 4-0 |  | Chungju Citizen | | | | |
| | Gangneung City |  | 2-0
Pro. |  | Pukyong National University | | | | |
| | Ansan Greeners |  | 7-0 |  | Suwon University | | | | |
| | Mokpo City |  | 3-1 |  | Jungnang Chorus | | | | |
| | Daejeon Korail |  | 3-1 |  | Gwangju | | | | |
| | Anyang |  | 2-1 |  | Changwong City | | | | |
| | Gimhae City |  | 0-0
(5-4
Pen.) |  | Cheongju City | | | | |
| | Seongnam FC |  | 1-0 |  | Daejeon Hana Citizen | | | | |
| | Korea University |  | 0-0
(1-3
Pen.) |  | Seoul E-Land | | | | |
| 2018/03/31 | Hwaseong |  | 2-3 |  | Yong In University | | | | |
| | Gimpo Citizen |  | 2-1 |  | Pyeongtaek Citizen | | | | |
| | Pocheon |  | 2-0 |  | Incheon University | | | | |
| | Paju Citizen |  | 0-1 |  | Gyeongju Citizen | | | | |
| 2018/04/04 | Busan IPark |  | 2-1 |  | Bucheon 1995 | | | | |
23/04 - 15:00
23/04 - 19:00
23/04 - 21:00
23/04 - 21:30
