An evil spirit that can escape the water only by possessing a living person. The evil spirit of a child who died unjustly while waiting for his mother alone. As her younger sister Soo-ah is attacked, she and her family suffer for a long time. Her mother Geum-jeong, a spiritual shaman, was in charge of the five elements' energy. She tried to use her coexistence and antipathy to escape from the water ghost, but in the end, Soo-ah disappears into the cold, deep water, and the lives of her remaining family fall apart. Then one day, Ga-yeong went to find her mother who suddenly disappeared. She heads to the reservoir that swallowed Soo-ah, where she discovers a mysterious body. Ga-yeong is chased by a terrible evil spirit that takes the form of her dead brother…
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