Forbidden Floor (2006)

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Divorced mother Chae-Min-Young (Kim Seo-Hyung) moves into a new studio apartment with her six year old daughter Joo-Hee (Kim You-Jung). Min-Young becomes disturbed when her neighbor, who lives one floor below her, complains about the noise coming from their apartment. Min-Young and Joo-Hee live quietly and do make much noise. Min-Young also notices strange behavior from other neighbors. Min-Young looks to uncover the truth behind the apartment complex.