Eun-yi is hired as a nanny in a lavish mansion by businessman Hoon (Lee Jung-jae) and his pregnant wife, Hae-ra (Seo Woo). When Eun-yi is seduced by the father of the house, she becomes the unwitting victim in a serious of traps laid by the women of the house - Hae-ra, her villainous mother (Park Ji-young), and their seemingly loyal but increasingly bitter housekeeper (Yun Yeo-jong).