Bong Joon-ho, 2003. South Korean detectives and the unsolved Hwaseong serial murders.
From Wikipedia
Memories of Murder is a 2003 South Korean neo-noir crime thriller film directed by Bong Joon Ho, from a screenplay by Bong and Shim Sung-bo, and based on the 1996 play Come to See Me by Kim Kwang-lim. It stars Song Kang-ho and Kim Sang-kyung. In the film, detectives Park Doo-man (Song) and Seo Tae-yoon (Kim) lead an investigation into a string of rapes and murders taking place in Hwaseong in the late 1980s, by a man known as the Hwaesong Murderer. The film is a semi-biographical retelling of Korea's police hunting Lee Choon-jae.