Wikipedia
Gap-dong
Gap-dong is a 2014 South Korean television series starring Yoon Sang-hyun, Sung Dong-il, Kim Min-jung, Kim Ji-won and Lee Joon. It aired on cable channel tvN from April 11 to June 14, 2014 on Fridays and Saturdays at 20:40 for 20 episodes.
The series is based on the real-life unsolved Hwaseong serial murders case, which involved the rape and murder of ten women from 1986 to 1991 in the Taean neighborhood of Hwaseong City. The case also inspired the 2003 film Memories of Murder.