- A 13-year old girl disappears at an old apartment building in the countryside. Hee-jin’s younger sister, So-jin, and her mother who is a Christian fanatic lives together in the countryside. One day, Hee-jin receives a call while she’s in Seoul going through college. Her mother tells her that So-jin has suddenly disappeared. Once she arrives, her mother tells her that only prayer can help So-jin return and she frequents the church all day. But Hee-jin calls the police instead and the detective in charge, Tae-hwan, conducts a routine operation and tells Hee-jin that So-jin simply can ran away from home. As Hee-jin keeps searching for So-jin, she falls deeper into a dark mystery that no one can understand.