Ka-young has suffered from aphasia since losing her younger sister in a tragic accident. She now lives an impoverished and desolate life taking care of her mother. One day, the susaekkwi- a water ghost that murders people appears again. Ka-young desperately runs away from the ghost who takes on the appearance of Ka-young’s sister chasing her without knowing why. The relationship of the surrounding characters intertwined and the mystery of the sister’s death is solved by the secret of five elements but Ka-young still cannot lead away from the ghost. Will she be able to survive and escape the ghost's pursuit?