Psychopath Diary (2019)

Yook Dong Sik is a 34-year-old office worker who is so weak and timid that he is used by everybody around him. After an incident, he becomes the scapegoat of his company, and so facing losing his job and his family turning their back on him, he decides to commit suicide. While doing so, he unexpectedly stumbles across a murder scene. While running away from the murderer he gets into an accident and wakes up with amnesia with the murderer's diary in his possession. With no clues to his true nature other than the diary, and his fragmented memory lining up with the diary entry, he begins to believe that he is in fact a psychopath serial killer. 30-year-old neighborhood police officer, Shim Bo Kyung is investigating a suspected serial homicide. After a few run-ins with Dong Sik, she believes that he is an extremely kind man. However, after one too many coincidences, she starts to suspect Dong Sik might be more involved in the case than she thought. 36-year-old Seo In Woo is a cold and meticulous psychopath. On the day of his 7th crime, things go wrong and he loses his diary where he writes of all his daily life and detailed description of his murders. This makes him paranoid and insecure.