Memories of Murder (2003)

In 1986, in the province of Gyunggi, in South Korea, a second young and beautiful woman is found dead, raped and tied and gagged with her underwear. Detective Park Doo Man and Detective Cho Yong Koo, two brutal and stupid local detectives without any technique, investigate the murder using brutality and torturing the suspects, without any practical result. Then Detective Seo Tae Yoon from Seoul comes to the country to help the investigations and is convinced that a serial killer is killing the women. When a third woman is found dead in the same "modus-operandi", the detectives find leads of the assassin.