"Water-killing ghosts" are evil spirits that must attach themselves to people before they can leave the water. As her younger sister Soo-ya (Park Ran) was attacked by an evil spirit, Ga-young's (Park Sun-hye) family was in grief. Although her mother, Kim Jung, who was once a wizard, used the characteristics of the five elements to drive away the evil spirit, Soo-ya still disappeared in the cold water. One day, in order to find her mother who suddenly disappeared, Ga-young walked towards the reservoir that swallowed her sister, and found a suspicious body there. Ga-young was also chased by a ghost who appeared in the appearance of her dead sister...