当丈夫患上梦游症，夜晚完全变了一个人，一对年轻夫妇的生活就发生了翻天覆地的变化。妻子十分担心丈夫会伤害他们的新生儿，再也无法入睡……
“水杀鬼”是一种必须附在人身上才能脱离水中的恶灵。随着妹妹秀雅（朴兰 饰）被恶灵袭击，佳英（朴善惠 饰）一家悲痛不已。虽然曾是巫师的母亲金贞利用五行相生、相剋的特性想赶走恶灵，但秀雅仍消失在冰冷的水中。某天，佳英为了寻找突然消失的母亲，走向吞噬妹妹的水库，并在那发现了可疑的尸体，佳英还被以死去妹妹的模样现身的鬼追杀……
Five members of the mountain bike club, Sangaja. To ride a mountain bike, we head to Chiaksan Mountain, where Min-joon's Uncle villa is located. After arriving at Chiaksan Mountain and enjoying the ride, strange things began to happen to the party…. And something unidentified chasing them! A desperate survival game for Sangaja's party to survive on Chiaksan Mountain begins.
