Stranger (2017)

Hwang Shi Mok, a prosecutor who lost his emotions due to childhood brain surgery aimed at controlling his violent tendencies, relies on his razor-sharp intellect and logical reasoning. Despite his impressive skills, he faces isolation due to his social ineptness and unwavering integrity, refusing bribes in a corrupt system. His life takes a turn when he stumbles upon a stabbing victim during a corruption investigation, leading him to cross paths with Lieutenant Han Yeo Jin. Together, they delve into the murky depths of the prosecutor's office while unraveling a chilling serial murder case.