Episodes
- S01E01 / Memory Loss
- S01E02 / I Am a Predator
- S01E03 / I’m Coming for You
- S01E04 / You and I Are the Same
- S01E05 / He’s Not Who He Seems
- S01E06 / Who is the Real Killer
- S01E07 / A Copy Cat Killer
- S01E08 / Closed Case
- S01E09 / It Wasn’t Me
- S01E10 / The Killer Inside Me
- S01E11 / I’m Not a Nice Guy
- S01E12 / The Confession
- S01E13 / Jailbreak
- S01E14 / I Remember
- S01E15 / The New Chairman
- S01E16 / The Final Battle
Overview
Yook Dong Sik works at a brokerage company. He is a pushover and a fool too naïve and kind-hearted for his own good. Dong Sik is at a point in his life where enough is enough and goes to end his life. However, the place he chose to end it all was a place where a murder was about to happen. As he flees in fear, he gets into an accident, and the following day, doesn’t remember a thing in his past. The only clue he has about himself is a red diary he unknowingly took. The journal contains details of all heinous killings of a psychopathic serial killer. Being an innate fool, he mistakenly begins to believe that he is a psychopathic serial killer, and the world he once knew changes drastically.