De zeventienjarige Joo-ri heeft het thuis niet gemakkelijk. Terwijl haar moeder psychisch achteruitgaat, gaat haar vader vreemd met een restaurantuitbater. Bovendien is haar klasgenote Yoon-ah de dochter van de minnares en dit komt hun relatie niet ten goede. Wanneer de affaire uitmondt in een zwangerschap, valt dit Joo-ri zwaar. Zij en Yoon-ah vechten openlijk op school. Wanneer hun broertje geboren wordt, is zijn leven in gevaar.
Nee, helaas is 미성년 nog niet beschikbaar op Netflix in Nederland.
| Visual Effects | Hong Jang-pyo | Special Effects Supervisor |
| Production | Simon Lee | Executive Producer |
| Art | Yoon Sung-hye | Art Direction |
| Crew | Yoo Mi-jin | Stunts |
| Editing | Hwang Eun-ju | Assistant Editor |
| Sound | Jung Hyun-su | Production Sound Mixer |
| Costume & Make-Up | Yoon Hwang-jik | Special Effects Makeup Artist |
| Directing | Gwon Hui-cheol | Assistant Director |
| Production | Jang Joo-yeon | Line Producer |
| Visual Effects | Kim Seong-hwan | VFX Supervisor |
| Visual Effects | 김종성 | Visual Effects |
| Camera | 박관열 | Grip |
| Directing | 김윤석 | Director |
| Writing | 김윤석 | Writer |
| Production | Lee Seung-bok | Producer |
| Writing | Lee Bo-ram | Writer |
| Production | 이동하 | Executive Producer |
| Costume & Make-Up | 채경화 | Costume Design |
| Sound | 김석원 | Sound Supervisor |
| Editing | 김선민 | Editor |
| Sound | Park Sung-do | Original Music Composer |
| Art | 방길성 | Production Design |
| Camera | Hwang Ki-suk | Director of Photography |
| Costume & Make-Up | Hwang Hyun-gyu | Makeup & Hair |
| Crew | 유상섭 | Fight Choreographer |
| Production | Nam Jin-hyun | Producer |
| Lighting | Kim Uk | Lighting Director |
| Production | Kim Do-su | Executive Producer |
| Production | Hwang Sun-il | Executive Producer |
| Art | Oh Jin-seok | Props |
