Using a different name, Ahn Bo Young moves into the mansion of a formerly wealthy elder, Wang Ae Ryung, as a caregiver with the intention to steal an expensive item from Mrs. Wang to clear her debt and care for her young daughter Da Jung who she snuck into the mansion in a suitcase. Kim Sa Mo, the niece and only blood relative of Wang who hired Bo Young, set conditions such as “Do not bring anyone inside, especially children” and “Do not go near the reservoir.”