Suhwa’s family is in crisis due to her husband's misfortune. When Suhwa’s future looks bleak due to the mountain of debt that has fallen on her, the twins Sowon and Riwon who lived next door proposes a contract. "In exchange for paying off the debt, she would work as a housekeeper in their house." However, Suhwa is troubled by the contract as it requires her body rather than being an ordinary housekeeper, but decides to accept the twins' contract anyway in order to protect her young son. Although she is a married woman with a child, she gradually becomes accustomed and familarises herself with the twins....