With the help of his family and a coach, an autistic man trains and competes in a lengthy marathon. The young man had always dreamed of competing in an event like that.
Unfortunately the movie Marathon is not yet available on HBO Max.
| Directing | Jung Yoon-chul | Director |
| Production | Seok Myung-Hong | Producer |
| Writing | Jung Yoon-chul | Writer |
| Writing | Song Ye-jin | Writer |
| Writing | Yoon Jin-ho | Writer |
| Sound | Jung Jin-wook | Production Sound Mixer |
| Visual Effects | Kim Gwang-su | Special Effects Supervisor |
| Production | Shin Chang-hwan | Producer |
| Production | Jeong Tae-sung | Executive Producer |
| Art | Lee Geun-ah | Production Design |
| Costume & Make-Up | Ham Hyun-joo | Costume Design |
| Lighting | Lee Jae-hyuk | Lighting Director |
