|Created by||Studio Dragon|
|Directed by||Lee Jong-jae|
|Country of origin||South Korea|
|Picture format||1080i (HDTV)|
|Audio format||Dolby Digital|
|Original release||November 20, 2019 –|
Psychopath Diary (Korean: 싸이코패스 다이어리; RR: Ssaikopaeseu Daieori) is a 2019 South Korean television series starring Yoon Shi-yoon, Jung In-sun and Park Sung-hoon. It premiered on tvN on November 20, 2019.
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 as Yook Dong-sik
- A timid and pushover man who works as a clerk at a stock company. His weak personality begins to change when he perceive himself as a killer.
- Jung In-sun as Shim Bo-kyung
- An officer in a patrol station.
- Park Sung-hoon as Seo In-woo
- The real psychopathic serial killer who is also the director of the stock company Dong-sik works at.
- Lee Han-wi
- Heo Sung-tae
- Choi Dae-chul
- Kim Ki-doo
- Lee Min-ji
- Kim Myung-soo
- Choi Sung-won
- Choi Tae-hwan as Shin Seok-hyun
- Hwang Sun-hee as Jo Yoo-jin
- Kim Gyul as Dong-sik's brother-in-law
- Jung Su-bin
In this table, the blue numbers represent the lowest ratings and the red numbers represent the highest ratings.
|Ep.||Original broadcast date||Average audience share|
|1||November 20, 2019||1.766%||1.730%|
|2||November 21, 2019||1.463%||1.361%|
|3||November 27, 2019|
|4||November 28, 2019|
|5||December 4, 2019|
|6||December 5, 2019|
|7||December 11, 2019|
|8||December 12, 2019|
|9||December 18, 2019|
|10||December 19, 2019|
|11||December 25, 2019|
|12||December 26, 2019|
|13||January 1, 2020|
|14||January 2, 2020|
|15||January 8, 2020|
|16||January 9, 2020|
- This drama aired on a cable channel/pay TV which normally has a relatively smaller audience compared to free-to-air TV/public broadcasters (KBS, SBS, MBC and EBS).
- "윤시윤·정인선·박성훈, 코믹 스릴러 '싸이코패스 다이어리' 주연 확정". Naver (in Korean). Digital Times. Retrieved September 7, 2019.
- "'싸이코패스 다이어리' 이한위 허성태→이민지까지, 퍼펙트 라인업(공식)". Naver (in Korean). Newsen. Retrieved September 7, 2019.
- "'싸이코패스 다이어리' 윤시윤X정인선X박성훈, 캐스팅 확정…믿보 라인업 구축". Naver (in Korean). Hankyung. Retrieved September 7, 2019.
- "Yoon Si-yoon, Jung In-sun, Park Sung-hoon Confirmed for "Psychopath Diary"". HanCinema. News1 Korea. Retrieved September 7, 2019.
- "Yoon Si-yoon and Jung in-sun Courted for Drama "Psychopath Diary"". HanCinema. Xports News. Retrieved September 7, 2019.
- "Hwang Sun-hee and Choi Tae-hwan Confirmed for "Psychopath Diary"". HanCinema. Retrieved September 7, 2019.
- "Kim Gyul to Star in "Psychopath Diary"". HanCinema. Wow TV. Retrieved September 7, 2019.
- "빅톤 정수빈, tvN '싸이코패스 다이어리' 합류…연기돌 행보(공식)". Naver (in Korean). Newsen. Retrieved September 24, 2019.
- "'싸이코패스 다이어리' 윤시윤·정인선·박성훈, 첫 리딩부터 '시너지↑'". Naver (in Korean). Ilgan Sports. Retrieved September 26, 2019.
- "Nielsen Korea". AGB Nielsen Media Research (in Korean). Retrieved November 20, 2019.