It tells the story of a service that provides wives to single people who need partners to bring to gatherings of married couples and school reunions. The story follows Choi Sang Eun as she becomes involved with Jung Ji Ho, who has a long-term exclusive contract for Mondays, Wednesdays, and Fridays, and with Kang Hae Jin, who signs a new contract for Tuesdays, Thursdays, and Saturdays.