Five years ago, back when she was just a rookie, Jung Mo-rae’s mentor, Seo Kang-jae, was her absolute nightmare. Now he’s back—this time as the executive director carrying the golden bloodline of SG Electronics, and her direct superior. Haunted by the dark memory of a drunken one-night stand with him on the night of her farewell party, Mo-rae does everything she can to avoid him. But Kang-jae calls her into his office and uses that mistake to blackmail her with an outrageous proposal. “Starting now, for exactly three months, once a week for 12 times in total. Sleep with me.”