The story of a man named Yook Dong-sik who coincidentally witnesses a murder and picks up the killer's diary. While fleeing the scene, he gets into a car accident causes him to lose his memory. Due to the diary in his possession, he mistakenly believes that he is a psychopathic serial killer.

• Yoon Shi-yoon
• Jung In-sun
• Park Sung-hoon
• Lee Han-wi
• Hwang Hyo-eun
• Lee Min-ji
• Choi Tae-hwan
• Han Soo-hyun