2. Round | 10/03/2018 | Gyeongnam FC | - | Jeju United | 2:0 | ||||
3. Round | 18/03/2018 | Ulsan Hyundai FC | - | Jeju United | 0:1 | ||||
4. Round | 31/03/2018 | Jeju United | - | Suwon Bluewings | 0:1 | ||||
5. Round | 08/04/2018 | Jeju United | - | Sangju Sangmu | 0:0 | ||||
6. Round | 11/04/2018 | Jeonnam Dragons | - | Jeju United | 0:3 | ||||
7. Round | 14/04/2018 | Jeju United | - | Incheon United | 4:2 | ||||
8. Round | 22/04/2018 | Jeju United | - | Jeonbuk FC | 0:1 | ||||
9. Round | 25/04/2018 | Pohang Steelers | - | Jeju United | 0:1 | ||||
11. Round | 02/05/2018 | Jeju United | - | Gangwon FC | 3:5 | ||||
12. Round | 05/05/2018 | Incheon United | - | Jeju United | 1:2 | ||||
13. Round | 12/05/2018 | Jeju United | - | Jeonnam Dragons | 1:0 | ||||
14. Round | 20/05/2018 | Sangju Sangmu | - | Jeju United | 0:0 |