A psychopath's ruthless serial murders have left the entire nation gripped with fear and chaos. A honest and justice-seeking rookie police officer and a veteran detective with tragic past, face against the killer. After the encounter with the psychopath, their lives totally change.
- Year: 2021
- Country: South Korea
- Genre: Crime, Mystery, Sci-Fi & Fantasy
- Studio: tvN
- Keyword: psychopath, detective, investigation, serial killer, crime scene, killer, wrongful suspicion, murder mystery, seemingly innocent but secretly evil, falling into madness
- Director: Choi Ran
- Cast: Lee Seung-gi, Lee Hee-jun, Park Ju-hyun, Kwon Hwa-woon, Kyung Soo-jin, Woo Ji-hyeon