My Friend Is a Murderer

Doo-hyun, who goes by the name the "Goblin", goes to prison for taking the fall for Young-min who killed their boss. Released after 10 years, Doo-hyun had been living a normal life, but Young-min goes so far as to kidnap Doo-hyun's daughter to keep his mouth shut. Enraged, Doo-hyun seeks revenge and announces the return of the real "Goblin".

'Geon-woo', brutally trampled by Daejinbuk High's best 'Sang-goo', vows revenge as he practices martial arts. After hearing about 'Geon-woo's comeback, 'Sang-goo' immediately starts to threaten and ask for bribes. To stop 'Sang-goo', they fight head-to-head. To determine who is the real 'best', the bloody fight begins!

Geon-woo used to be a promising taekwondo athlete, but quit after kicking an unfair judge in the face. On his first day at Deoksang High, he gets involved in a fight with the school bullies, but defeats them and becomes the subject of school gossip. While Geon-woo was previously tired with everything in his life, he slowly finds interest after his fight with the bullies. In the end, he takes over the school by defeating Deok-soo, the school's best fighter. However, Sang-goo, the best fighter of Dae Jin High, asks him for a bribe, but Geon-woo declines him. Sang-goo is not happy and wants to break Geon-woo.