Han Yewon is a very diligent professional woman who always takes the initiative more than anyone else at work. However, there’s a secret she can’t tell anyone: she’s much more passionate than she appears! While she enjoys herself to the fullest when she’s having fun, at the office she perfectly maintains her reputation and image as an outstanding, flawless professional. For Yewon, managing that duality is the greatest pleasure in her life. But suddenly, she faces the biggest crisis of her life: Choi Eunho, the man she slept with the night before, joins the company as her new colleague, although he’s on another team. Will Yewon be able to protect her reputation?