1986 Gyunggi Province. The body of a young woman is found brutally raped and murdered. Two months later, a series of rapes and murders commences under similar circumstances. And in a country that had never known such crimes, the dark whispers about a serial murderer grow louder. A special task force is set up in the area, with two local detectives Park Doo-Man (Song Kang-Ho) and Jo Young-Goo (Kim Roe-Ha) joined by a detective from Seoul who requested to be assigned to the case, Seo Tae-Yoon (Kim Sang-Kyung).