Cha Woo-sol has been the victim of bullying all his life. When he defends himself against one of his tormentors one day, he ends up in a juvenile detention center, a place where the stronger have the say. Soon he is targeted by one of the most merciless inmates. In desperation, he turns to Jung Do-hyun, a former MMA champion, and asks him to teach him how to fight. While Woo-sol fights against his fears and overcomes his physical and mental limits step by step, he must learn to survive without help and survive in the harsh reality of prison! New product