The year is 1986. In a small town outside Seoul, the body of a dead woman is found inside a small ditch. Over the course of six years, 10 women were raped and murdered in a 2km radius. Korean society's first serial killer took the lives of 10 victims, ranging from a 71 year-old grandmother to a 13 year old schoolgirl. As time went on, the methods of the killer grew more bold and well-planned. One victim was stabbed 19 times in the chest, while another victim was found with nine pieces of a peach embedded inside her. Other than the victims, the killer left not a single shred of evidence. Over 3,000 suspects were interrogated. At least 300,000 police took part in the massive investigation. But not a single person was indicted for the crimes.

At a time in Korea when a murder investigation only meant grilling those who knew the victim, For these officers everything was a new experience. There was no profiling mechanism, nor any idea of preserving the crime scene for forensic investigation. Only search and interrogation based on the detectives' sense of duty and persistence. In this age of ignorance, two detectives at the bottom of an ill-supported police force, have only themselves to rely on to face this horrific series of events.