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During the late 1980s, two detectives in a South Korean province attempt to solve the nation's first series of rape-and-murder cases.
Forensic pathologist Kang is assigned to examine the dismembered corpse of a female murder victim. Detective Min points to a fanatic environmentalist, Lee Sung-ho, as the primary suspect. But when Kang’s daughter is kidnapped, a manipulative game begins between Kang and Lee, who holds secrets about the homicide case.
Chinese secret agent Da-hee receives intel that a large number of illegal firearms are being smuggled into Korea and is sent to investigate the case. She meets Su-han, who is supposed to help her with the case, but due to his lackluster skills they fight over trivial things. But as their witnesses are suddenly murdered, the two of them quickly become the prime suspects.
Yeong-sik is a personal tax accountant. Two years into his marriage, he feels his wife is not like before. He coincidentally sees his wife meeting with another man so he puts a tail on her only to come back empty. Frustrated, Yeong-sik tails her himself but there's nothing out of the ordinary. A while later, So-yeon's body is found in an isolated area and the police call in Yeong-sik and Oh Min-soo, the man So-yeon met for investigation. Oh Min-soo denies he did anything and that he even had an affair with So-yeon. Yeong-sik calls the police and asks how his investigation went but the police say he just denied it and that they'll call them when the case is closed. But what he wants to know how he testified about his wife, who the criminal is and what the relationship between So-yeon and Oh Min-soo is...
