When she was a rookie, Jeong Mo-Rae had a one-stand with Seo Kang-Jae, Five tears later, they meet again, but this time, he's a senior executive and her direct supervisor. Mo-Rae, reminiscing about her drunken one-night stand with Seo Kang-Jae on the day of his farewell party, tries to avoid him. However, Seo Kang-Jae calls her to his office, and uses her mistake as an excuse to threaten her, and makes her a proposition: "For exactly three months, once a week, 12 times total. Sleep with me."