Bo-Yeong moves into the mansion of the previously wealthy grandmother, Wang, as a caregiver with a dangerous intention. Mrs. Kim, the only blood relative of Wang who hired Bo-Yeong, sets conditions such as 'Do not bring anyone, especially children,' and 'Do not go near the reservoir'. Ominous and bizarre signs continue in grandmother Wang's huge mansion located next to a reservoir called 'Gwimot', where people are dying, and Bo-Yeong finds out that foreigners who have visited the place have suffered a mysterious death.—Mahou 5 star