Kim Hye-ja plays an unnamed widow living alone with her only son, selling grain in a small town in southern South Korea. Her son, Do-joon, is a shy, quiet and somewhat mentally handicapped young man. When a high school girl is found dead, the police arrest Do-joon. His defense attorney is unreliable, and the police trick Do-joon into signing a confession, leaving him facing a long jail sentence. The mother, horrified and unconvinced that Do-joon is even capable of murder, gets involved in unraveling the details of the murder and the background of the victim to try and prove her son's innocence. Mother will be screened in cinemas from the 24th of June.