Two sisters, Su-Mi and Su-Yeon, come home after recovering from a long illness. Their new stepmother, Eun-Joo, welcomes them; but Su-Mi, the elder sister, intentionally avoids her while Su-Yeon, the younger sister, shows fear for her weird stepmother. After their first dinner back home, Su-Mi and Su-Yeon go to bed in their dark and dismal rooms. One day, Mu-Hyun goes into town and Su-Mi can't find her sister Su-Yeon anywhere. Feeling petrified, Su-Mi looks all over the house for her sister and then discovers bloody stains on the floor.