Shark: The Beginning

Cha Woo-sol is a bullied teenager who ends up in a juvenile detention center after an unexpected accident. There, he meets Jeong Do-hyeon, a mixed martial arts champion, and begins trying to overcome the limits that have left him unable to fight back. As Woo-sol faces life in detention, his meeting with Do-hyeon becomes the starting point for changing how he responds to the violence around him.