Five years ago, when Jung Morae was just a rookie employee, Seo Kang-jae made her life miserable. Now he's back, this time as an executive director from SG Electronics' prestigious family and as her direct superior. At a farewell party, with alcohol clouding her judgment, Morae made the unforgettable mistake of sleeping with him. Determined to keep her distance, she avoids him at all costs, that's until Kangjae calls her into his office. Using her past mistakes against her, he corners her with a proposition she can't refuse. "Starting now, for exactly three months. Once a week. Twelve times in total. Sleep with me."