Undeniably attractive, talented, and charming, Choi Sangeun 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, Sangeun 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, Jeong Jiho has been using Sangeun’s services every Monday, Wednesday, and Friday, for the past five years. A man shrouded in mystery, Sangeun knows virtually nothing about Jiho 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 Haejin. A popular actor who employs her services on Tuesdays, Thursdays, and Saturdays, Haejin often makes Sangeun’s heart flutter.