Soo-kyung works as a reporter. She has an older brother, Sung-ho, and younger sister, Joo-mi. She thinks of her two siblings as burdens. One day, Nak appears in front of them. He is their youngest sibling.
Unfortunately the movie My Little Brother is not yet available on Disney Plus.
| Lighting | Lee Je-woo | Lighting Director |
| Crew | Jeong Yoon-heon | Martial Arts Choreographer |
| Visual Effects | Cho E-suck | VFX Supervisor |
| Crew | Song Min-seok | Stunts |
| Sound | Ahn Sung-il | Production Sound Mixer |
| Directing | Ma Dae-yun | Director |
| Art | Kim Jin-chul | Production Design |
| Costume & Make-Up | Yang Hee-hwa | Costume Design |
| Editing | Moon In-dae | Editor |
| Production | Kim Sung-jin | Co-Executive Producer |
| Production | Jay Song | Co-Executive Producer |
| Editing | Jeong Gye-hyeon | Editor |
| Camera | Jo Yeong-sang | Director of Photography |
| Art | Yoon Beom-seok | Art Direction |
| Writing | Yoon Pil-joon | Writer |
| Crew | Jung Doo-hong | Fight Choreographer |
| Production | Huh Soo Young | Co-Executive Producer |
| Sound | Seo Ji-hoon | Boom Operator |
