In 1986, in Huacheng County, Gyeonggi Province, South Korea, in a hot summer, the body of a woman was found on the edge of the field. Small-town police agent Park (Song Kanghao) and Agent Su (Kim Sang-ching) from Seoul take over the case. the only thing that can be confirmed is that the woman's body was raped before her death. The serious lack of clues makes the inexperienced Agent Park and his partner Agent Cao (Jin Luohe) only rely on rough extortion and sixth sense to infer that the suspect has been beaten into a confession several times. While Agent Su was objective and calm, according to reasonable analysis, several times to eliminate suspicion, the police continued to prove and overthrow contradictions, but innocent women were brutally killed one after another, they had to reach a consensus to cooperate. At this time, a young man who closely matches the characteristics of the crime (Park Hai-ri is acted the role of) becomes the biggest suspect, the police lock him nervously, and the DNA test report is also sent to the United States, but the case does not stop here.
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