Jung In-sun is a South Korean actress. She is best known for her roles in the television dramas Psychopath Diary (2019), My Secret Terrius (2018), Welcome to Waikiki (2018), Circle (2017), Naked Fireman (2017) and Basketball (2013).
Yook Dong-sik works in a brokerage company. One day, he witnesses a gruesome murder and comes across a diary that contains a detailed list of the murder logs. He flees and gets into a car accident. He lost his memory and thought that he is the psycho serial killer. His personality changes drastically.