2. Round | 10/03/2018 | Gyeongnam FC | - | Jeju United | 2:0 | ||||
4. Round | 31/03/2018 | Jeju United | - | Suwon Bluewings | 0:1 | ||||
10. Round | 28/04/2018 | Daegu FC | - | Jeju United | 1:4 | ||||
12. Round | 05/05/2018 | Incheon United | - | Jeju United | 1:2 | ||||
15. Round | 07/07/2018 | Suwon Bluewings | - | Jeju United | 2:3 | ||||
17. Round | 15/07/2018 | Jeju United | - | Daegu FC | 1:2 |