Undeniably attractive, talented, and charming, Choi Sang-eun is the living definition of the perfect partner. This is exactly why instead of marrying, she chooses to employ her skills as a contract marriage master. Transforming herself into the perfect partner for each of her clients, Sang-eun allows those who employ her services to live the perfect single life, without having to agree to a committed, life-long relationship. A long-term client, Jung Ji-ho has been using Sang-eun’s services every Monday, Wednesday, and Friday, for the past five years. A man shrouded in mystery, Sang-eun knows virtually nothing about Ji-ho but that doesn’t stop her from developing some rather unexpected feelings for him. Making her life even more difficult are the equally unexpected feelings she’s recently developed for one of her newest clients, Kang Hae-jin. A popular actor who employs her services on Tuesdays, Thursdays, and Saturdays, Hae-jin often makes Sang-eun’s heart flutter.