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.
You can now watch My Little Brother online on the following streaming providers in the United States.
| 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 | Jay Song | Co-Executive Producer |
| Production | Kim Sung-jin | 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 |
| Lighting | Lee Je-woo | Lighting Director |
| Visual Effects | Cho E-suck | VFX Supervisor |
| Sound | Ahn Sung-il | Production Sound Mixer |
| Crew | Jeong Yoon-heon | Martial Arts Choreographer |
| Crew | Song Min-seok | Stunts |
