Two friends in the past were victims of serious school bulling. One could not resist his trauma, and becomes a serial killer, walking in the path of revenge. Another one tries his best to overcome the trauma and becomes a police detective. He now faces tragic fate to risk his life to capture the serial killer.

• Kim Dong-wook
• Kim Sung-kyu
• Chae Jung-an
• Choi Hyeon-jin
• Han Soo-yeon
• Lee Ji-ha
• Jung Eui-jae
• Oh Min-suk