Park Bok Nyeo is a housekeeper who keeps her feelings — and her past — to herself. With a cold and mysterious air, she sweeps into the home of the newly widowed Eun Sang Chul and his four children, who are in desperate need of reconciliation. Can this antisocial woman not only keep the house together, but also the family? At this point, Sang Chul will take any help he can get, even if it's in the form of a creepy Mary Poppins figure.