Plot: 1986. In a rural district of South Korea, two women have been recently raped and murdered. Working on the case are detectives Park Doo-man and Cho Yong-koo. Their efforts are impeded by some sloppy crime scene procedure by the police. Their methods of solving cases are also quite basic, essentially amounting to beating confessions out of suspects. All this leads to nothing and the police chief brings in a more sophisticated and intelligent detective from Seoul, Seo Tae-yoon. With his arrival the methods improve but they still don't have the killer. Then another woman is found murdered and a pattern emerges.
Alternative Plot: In 1986, Park (Song Kang-ho) and Cho (Kim Roi-ha) are two simple-minded detectives assigned to a double murder investigation in a South Korean province. But when the murderer strikes several more times with the same pattern, the detectives realize that they are chasing the country's first documented serial killer. Relying on only their basic skills and tools, Park and Jo attempt to piece together the clues and solve the case in this thriller based on true events.
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