Sin of a Family

A body found at a lake is identified by police as Jung Min Hwan, a young autistic boy, who went missing two months earlier. While struggling in his troubled relationship with his son Kyung Soo, Detective Jo Chang Shik is assigned to the case. As part of the investigation, he visits the victim's family and tries to unearth their family secrets, which may have caused Min Hwan's death.
(Source: Wikipedia)