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You can stream Psychopath Diary (2019) on Rakuten Viki with a subscription.

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.

A man mistakes a serial killer's journal for his own autobiography after a sudden bout of amnesia. This chaotic identity crisis turns a dark crime premise into a hilariously frantic race to outrun a real monster.