In 1999 houdt een tiener een jongen op school nauwlettend in de gaten namens haar verliefde vriendin. Maar dan raakt ze zelf verwikkeld in een liefdesverhaal.
Ja! de film 20th Century Girl is nu beschikbaar om te kijken op Netflix in Nederland.
| Directing | Bang Woo-ri | Director |
| Visual Effects | Jung Seok-jae | VFX Supervisor |
| Camera | Cho Young-jik | Director of Photography |
| Art | 이나겸 | Production Design |
| Writing | Bang Woo-ri | Writer |
| Crew | Jang Eun-young | Post Production Supervisor |
| Editing | No Byeong-uk | Digital Intermediate |
| Visual Effects | Kim Gwang-wook | VFX Supervisor |
| Crew | Yun Seok-jin | Martial Arts Choreographer |
| Editing | 양진모 | Editor |
| Production | Kim Yong-eon | Producer |
| Camera | Seo Ji-hyeong | Still Photographer |
| Costume & Make-Up | An Ji-hyeon | Costume Design |
| Visual Effects | Hong Jang-pyo | Special Effects Supervisor |
| Costume & Make-Up | 박예리 | Makeup & Hair |
| Crew | Shin Young-hoon | Martial Arts Choreographer |
| Sound | Shon Yong-ik | Production Sound Mixer |
| Costume & Make-Up | Shin Soo-bin | Costumer |
| Costume & Make-Up | Yoon Na-yeon | Costumer |
| Production | 임승용 | Executive Producer |
| Sound | Lee Sung-june | Sound Supervisor |
| Lighting | Jung Hae-ji | Lighting Director |
| Sound | 달파란 | Original Music Composer |
