| 18. Jornada | 02.07.2017 | Jeonnam Dragons | - | Jeju United | 2:2 | ||||
| 19. Jornada | 09.07.2017 | Suwon Bluewings | - | Jeju United | 1:0 | ||||
| 20. Jornada | 12.07.2017 | Jeju United | - | Jeonbuk FC | 2:1 |  |
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| 21. Jornada | 16.07.2017 | Jeju United | - | FC Seoul | 1:2 | ||||
| 22. Jornada | 19.07.2017 | Sangju Sangmu | - | Jeju United | 0:3 |  |
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| 23. Jornada | 22.07.2017 | Jeju United | - | Pohang Steelers | 3:2 | ||||
| 24. Jornada | 02.08.2017 | Jeju United | - | Daegu FC | 2:0 | ||||
| 27. Jornada | 19.08.2017 | Jeju United | - | Jeonnam Dragons | 3:1 |  |
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| 31. Jornada | 20.09.2017 | Suwon Bluewings | - | Jeju United | 2:3 | |
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| 32. Jornada | 23.09.2017 | Sangju Sangmu | - | Jeju United | 2:2 | ||||
| 33. Jornada | 01.10.2017 | Jeju United | - | Gwangju FC | 1:1 | ||||
| 28. Jornada | 08.10.2017 | Jeju United | - | Jeonbuk FC | 0:1 |
Corea del Sur