Boyeong moves into the mansion of Wang as a caregiver with an intention to steal the former millionaire's hidden pieces of jewelry. Kim, the only relative of Wang who hired Boyeog, sets strange conditions such as 'Do not bring anyone, especially children' and 'Do not get close to the reservoir next to the house'. However, Boyeong breaks the rule and brings her daughter to the place. Ominous and bizarre signs start to appear in Wang's huge mansion, which leads Boyeong to find out that the visitors from the past suffered mysterious deaths.