Psychopath Diary

Psychopath Diary aired on the Korean network tvN from November 20, 2019 to January 9, 2020, and has been available internationally with subtitles on streaming platforms such as Viki and iQIYI. Availability may vary by region and change over time. It is also sometimes found on YouTube through official channel clips with fan-made subtitles.

Psychopath Diary follows Yook Dong-sik, a timid and unlucky man who accidentally stumbles upon the diary of a serial killer and then suffers amnesia from an accident. Believing the diary is his own, he concludes he must be a psychopath himself. The dark comedy escalates as the real killer, played by Park Sung-hoon, begins to notice this confused impostor.

Yoon Shi-yoon stars as Yook Dong-sik, the bumbling protagonist who mistakenly believes he is a psychopath. Jung In-sun plays a sharp rookie police officer who becomes entangled in the story, and Park Sung-hoon plays the actual serial killer Seo In-woo. The series was an original tvN production.

Psychopath Diary ran for 16 episodes during its broadcast run on tvN from November 2019 to January 2020. The series aired on Wednesday and Thursday evenings, following the standard scheduling format for Korean cable dramas. Each episode runs approximately 60 to 70 minutes.