有听力障碍的珠英（李先彬 饰），与妹妹珠憘（韩秀娥 饰）终于买下梦寐以求的新房，却没想到噩梦才正要开始。某天起，珠憘开始被来自公寓某处的神秘噪音折磨得身心俱疲。那让人不耐的楼层噪音，不仅让她无法安睡，更像是潜藏某种黑暗秘密的警告。正当珠英离家工作时，珠憘突然失踪，让惊慌失措的珠英立刻赶回家，并与珠憘的男友基勋（金珉锡 饰）联手追查真相。同时，住在楼下的神秘男子（柳炅秀 饰）也长期受噪音困扰，认定一切都源于楼上的这对姊妹，让他情绪逐渐崩溃，扬言要对她们痛下杀手……真相究竟藏在谁的耳中？噪音背后，又是谁的疯狂正在近逼？
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