A teenage girl, Su-mi (Im Soo-jung), is being treated for shock and psychosis in a mental institution. She is released and returns home to her family’s secluded estate in the countryside with her father (Kim Kap-soo) and younger sister Su-yeon (Moon Geun-young), whom she is protective over. The sisters have a cold reunion with their stepmother, Eun-joo (Yum Jung-ah), who constantly requires medication. Su-mi has a nightmare of her late mother’s ghost.
The next day, she finds family photos which reveal that Eun-joo was formerly an in-home nurse for her then-terminally ill mother. She discovers bruises on her sister’s arms and suspects Eun-joo being responsible. Su-mi confronts Eun-joo about the bruises but Eun-joo refuses to apologize for her actions. That night, their uncle and aunt arrive for dinner, and Eun-joo tells bizarre stories that bewilder them.
The aunt suddenly suffers a violent seizure and suffocates. After recovering, she tells her husband that she saw the ghost of a dead girl beneath the kitchen sink during her seizure.
Eun-joo tries to see what is beneath the sink, but the ghost girl violently grabs her arm. Eun-joo’s relationship with her stepdaughters sours after she finds her pet bird mutilated and killed and her personal photographs defaced. As punishment, she locks Su-yeon in the closet. Su-mi releases her and tells her father about the abuse. Her father begs her to stop acting out and informs her that Su-yeon is dead. Su-mi refuses to believe it as she sees her sister sobbing uncontrollably. The next morning, Eun-joo drags a bloodied sack through the house, whipping it. Su-mi believes that Su-yeon is inside the sack. Eun-joo and Su-mi get into a violent physical altercation. Su-mi’s father arrives to find an unconscious Su-mi.
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