| Group I | 19/09/2023 | Ulsan Hyundai FC | - | BG Pathum United | 3:1 |  |
|||
| Group I | 03/10/2023 | Kawasaki Frontale | - | Ulsan Hyundai FC | 1:0 | ||||
| Group I | 07/11/2023 | Johor Darul Ta’zim | - | Ulsan Hyundai FC | 2:1 | ||||
| Group I | 28/11/2023 | BG Pathum United | - | Ulsan Hyundai FC | 1:3 | ||||
| Group I | 12/12/2023 | Ulsan Hyundai FC | - | Kawasaki Frontale | 2:2 | |
|||
| Round of 16 | 15/02/2024 | Ulsan HD FC | - | Ventforet Kofu | 3:0 | ||||
| Round of 16 | 21/02/2024 | Ventforet Kofu | - | Ulsan HD FC | 1:2 | ||||
| Quarter-finals | 05/03/2024 | Jeonbuk FC | - | Ulsan HD FC | 1:1 | ||||
| Quarter-finals | 12/03/2024 | Ulsan HD FC | - | Jeonbuk FC | 1:0 | ||||
| Semi-finals | 24/04/2024 | Yokohama F. Marinos | - | Ulsan HD FC | 5:4 pso |
Hungary