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Piano composer Dong-sik (Kim Jin-kyu) and his pregnant wife (Jeung-nyeo Ju) need extra help around the house, so they hire a housemaid (Eun-shim Lee), whose precociousness soon gives way to troubling behavior. Tensions between her and Dong-sik lead to an affair, and while the pregnancy ends in a miscarriage, it also results in the maid becoming obsessed with killing the entire family, starting with their older son. Soon their comfortable home becomes a physical and psychological battleground. imdb.com