The lineup is set for upcoming tvN thriller drama Psychopath Diary, which sounds a lot scarier than the set up seems. Yoon Si Yoon, Jung In Sun, and Park Sung Hoon have signed up for the drama to play a cat-and-mouse game with a mistaken identity twist. Yoon Si Yoon is a mousy, pushover of a stock broker who tries to kill himself but fails and ends up with a lost memory but the diary of a serial killer in hand. He thinks HE’S the serial killer which totally upends his life. Jung In Sun is a dogged police detective while Park Sung Hoon is the real serial killer and also Yoon Si Yoon’s boss at work. It’s a real shit-storm of a mess and tvN is going to sort it all out come early winter 2019 when the drama airs, with the PD of Dear Husband of 100 Days and the screenwriter of Pied Piper and Liar Game at the helm.