Based on the true story of a still-unsolved series of rapes and murders that happened in rural Korea in 1986-1991, this film by Bong Joon-ho (Barking Dogs Never Bite) follows the ultimately unsuccessful police investigation led by a pair of small town cops. After bungling the investigation of the first murder, they pin it on a retarded man who lives in the community. When the second murder occurs, it becomes clear that they are out of their depth. An investigator from Seoul is called in to help and his by-the-book manner causes friction with the local officers, who are more accustomed to beating confessions out of suspects that employing more conventional investigative techniques. But when the criminal continues to elude them, even he reaches his breaking point.
by Tom Vick synopsis