Psychopath Diary

Yook Dong-Sik (Yoon Shi-yoon), an analyst who works at Daehan Securities. He has a timid personality and he can't even get angry at the people who look down upon him. One day, shortly after failing on his attempt of suicide, he witnesses a murder. He unintentionally picks up a diary belonging to murderer, on which was written the log of his murders. Yook Dong-Sik flees with the diary, but he is accidentally hit by Police Officer Shim Bo-Kyung's (Jung In-sun) patrol car which causes him to suffer from retrograde amnesia. Due to the diary in his possession, Yook Dong-Sik mistakenly believes he is a psychopath. Since that moment, his behavior started to change. Shim Bo-Kyung, who got involved with Yook Dong-Sik, decides to catch the serial killer.Meanwhile, Seo In-Woo (Park Sung-hoon), the director and son of the chairman of Daehan Securities where Yook Dong-Sik works turns out to be the heartless psychopath serial killer. He loses his diary when his 6th victim, a homeless old man tossed his diary away. He feels insecure ever since. [About:]Psychopath Diary is a 2019 South Korean television series starring Yoon Shi-yoon, Jung In-sun and Park Sung-hoon. It aired on tvN from November 20, 2019 to January 9, 2020.[Source: Wikipedia]