Eun-joo, the stepmother, welcomes two sisters who come back home after recovering their health, but Su-mi, the elder sister, intentionally avoids her and Su-yeon, the younger sister, shows a smack of fear for her stepmother. On their first night, Su-yeon sneaks in Su-mi's room confessing there is someone in her room and Su-mi sees a ghost of her late mother who hung herself in Su-yeon's closet. Strange things begin to happen since then; a ghost haunts the house and stepmother's birds are poisoned to death. Assuming Su-yeon is behind the inauspicious incidents, the stepmother locks her in the closet, and when Su-mi learns about the cruel punishment, conflict between the stepmother and two sisters gets bitter than ever.
One day, Mu-hyun, the father goes to town and Su-mi finds there is no sign of her younger sister, Su-yeon and Su-mi sports Eun-joo dragging a big bag through the dark corridor leaving bloody stains behind her. Su-mi follows bloody trace of the bag and she confronts with Eun-joo on her way of tracking. They starts to fight vehemently and Su-mi falls down struck by Eun-joo in the end... A while later, Mu-hyun comes back to the house and founds Su-mi fallen on the floor alone and enraged Mu-hyun exclaims that Su-yeon was already dead. His exclamation awakes a series of memories and hidden secrets buried deep inside of Su-mi...