情事:小姨子的爱

　　Two friends work as cleaners whose jobs are to clean homes and places where people have died or dead bodies are found. One day, they are tasked with cleaning a house where there were three dead bodies inside. Their job is to clean the corpses that have rotted. When they arrived there, they found that there are strange things happening and then they discover a strange book.

 舞台设定在崇拜水龙守护神的海底王国「海炎国」，这里因神秘污染和“强行唤醒沉睡水龙”的阴谋陷入危机。利姆露一行人原本是来海岛度假，却被卷入这场深海危机，从悠闲摸鱼被迫营业，潜入苍海深处揭开阴谋、阻止海底文明覆灭。

　　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？