Catching a Killer: The Hwaseong Murders - Episode Guide

Part one opens with a string of shocking murders but it's not until the fifth murder in four months that police finally initiate a broad investigation. Three more women are killed before police finally make an arrest - 22-year-old Sung-yeo Yoon.

Part two sees Yoon give a first-hand account of his arrest and the police torture that led to his confession. A confession that put him in prison for 20 years. But with an anonymous tip-off and the discovery of new forensic evidence in 2019, Yoon's guilty verdict is put to test.