Hyun-soo, a C.E.O of a private detective agency, visits a pension with a client asking for her dog. While waiting outside of pension, he is falsely accused of kidnapping the client. During the arrest Hyun-soo, a serious car accident occurs and people misunderstand Hyun-soo as a prosecutor instead of a suspect. To find the real criminal, Hyun-soo pretends to be a prosecutor. Hwa-jin is an elite prosecutor but demoted to the provinces while trying to catch a law firm conglomerate Do-hoon, who colluded with the prosecutor’s leadership, meets Hyun-soo. Hwa-jin finds out the case is related to Do-hoon, she begins cooperating with Hyun-soo. While cooperating is on-going, they realize that there is a dirty truth behind the crime.
Unfortunately the movie Gentleman is not yet available on HBO Max.
| Directing | Kim Kyoung-won | Director |
| Editing | Lee Hye-min | Colorist |
| Writing | Kim Kyoung-won | Writer |
| Camera | Byun Bong-sun | Director of Photography |
| Lighting | Song Hyun-suk | Lighting Director |
| Art | Jo Hwa-seong | Production Design |
| Sound | Dalpalan | Original Music Composer |
| Production | Lee Jae-deok | Line Producer |
| Camera | Lee Hyun-gyu | Key Grip |
| Crew | Yun Seok-jin | Martial Arts Choreographer |
| Sound | Lee Seung-yeop | Sound Supervisor |
| Editing | Kim Woo-hyun | Editor |
| Editing | Kim Hyeon-seo | Editor |
| Camera | Kwon Young-il | "B" Camera Operator |
| Directing | Jin Sung-hyun | Assistant Director |
| Art | Park Gyu-bin | Production Design |
| Costume & Make-Up | Kim Ha-kyoung | Costume Design |
| Costume & Make-Up | Lee Jin-young | Makeup & Hair |
| Costume & Make-Up | Pi Dae-seong | Special Effects Makeup Artist |
| Visual Effects | Do Gwang-sup | Special Effects Supervisor |
| Sound | Park Seong-ho | Production Sound Mixer |
| Visual Effects | Min Jun-ho | VFX Supervisor |
| Costume & Make-Up | Seol Ha-un | Special Effects Makeup Artist |
