The story revolves around two detectives, Han Jae-suk (Kang-ho Song) and Park Doo-man (Kyun-sang Choi), who are tasked with solving a series of gruesome murders in a small town in South Korea in the 1980s. As the investigation unfolds, the detectives become increasingly obsessed with solving the case, but their efforts are hindered by the lack of leads and the pressure from their superiors.