Fan Casting Speak No Evil

A mute, mentally-disabled young man is a survivor of violence from a young age when he decides to escape his hometown to live with his grandfather as a child. Years pass, and the mute man and his grandfather are living in financial strife, but are happy together... until a tenant moves in wife them, seeming to steal away the life he shared with his grandfather slowly, but surely. This leads him to question if the tenant is really that friendly, and is he really who he says he is? A series of risky investigations eventually leads him to discover an ugly truth!