Following the story of Ran, who confronts a mysterious organization by participating in a no-rules deathmatch after discovering her missing younger sister Yuzuki is involved in a crime. With danger at every corner, Ran must trade in her boxing gloves for brass knuckles. Will she save her sister?
You can now watch Knuckle Girl online on the following streaming providers in the United States.
| Directing | Chang | Director |
| Writing | Yoo Gap-yeol | Writer |
| Writing | Jung Byeong-sik | Adaptation |
| Directing | Choi Bong-rock | Action Director |
