A light turns on in a first-floor apartment room. A camera peers into the room from outside, through the balcony. A woman dressed like a student returns home, unaware of a strange man standing beyond the window. Wearing workout clothes, she becomes absorbed in exercising while watching a diet instructional video. After some time, she drinks water from the refrigerator and appears drowsy. Mysterious hands suddenly reach out toward her sweaty body from the darkness... Inside the quiet room, an eerie atmosphere begins to spread.