A beautiful youthful mother-in-law and a son-in-law live together My mother - in - law is a secret to my husband and wife! Married for 3 years, married couple. Due to the failure of Dohan 's business, he lost his house and went to his father' s house. Sunyoung, who has become unattractive to her husband's incompetence, begins to go clubbing and winds with Jung-hyun, whom she met there. I do not know what to say to Sunyoung, who gets drunk every day or goes out of town. One day, however, Sunyoung was informed that his father, who was on business trip, would go to his new stepmother who would remarry. I met her at her father's place of residence, remarried and arranged her house to live with her, but suddenly she had come first because of the extended travel schedule. Sunyoung does not welcome the sudden stepmom, but sees the ignorance of his wife. The young and young stepmother's daughter and the three elderly people begin the awkward living together.