Deuk Pal is about to become the boss of the Chilsung Gang. While mulling over giving up his dream of going to university, he tries to save Yi Heon from jumping off a bridge. Unfortunately, Deuk Pal loses his life but takes over Yi Heon's body. He learns of Yi Heon's misfortunes and resolves to avenge his suffering as a victim of bullying.

Deuk Pal, now inhabiting Yi Heon’s body, arouses suspicion from Se Kyung due to his noticeable deviation from his usual self. Despite Deuk Pal's attempts to mimic Yi Heon's behaviour, the other kids begin to question the sudden change in him. Particularly with Jae Min persisting in ridiculing Yi Heon, Deuk Pal plots a subtle revenge for him.

Deuk Pal proves he can fight in Yi Heon's body and gains control over Jae Min and his underlings. The kids at school can't believe how different Yi Heon is and are shocked. Se Kyung gets DNA testing done to see if Yi Heon is still the Yi Heon he knows, and Deuk Pal focuses on his studies and setting things right for Yi Heon. Meanwhile, Deuk Pal learns about what happened the night before Yi Heon died from Se Kyung as they become closer.

Deuk Pal and Se Kyung save Yi Heon's mom from getting kidnapped. Luckily, she was unharmed. Although he has a hunch about who might be responsible, Deuk Pal vows to protect Yi Heon and his family without the police involved. Meanwhile, Jae Min approaches Deuk Pal to find out if the police are looking for him, but Se Kyung confronts him about his involvement in the attempted kidnapping.