[COMPLETED] Kim Jisoo, a hard-working ad executive and a wonderful single mother to her daughter--Ella, gets teamed up with one of the company's most uptight coworker, Park Chae-young, to create a Christmas commercial of a new music system. To make matters even more complicated for Jisoo, she's Rose's Secret Santa for their annual office gift exchange. How will Kim Jisoo prove to Rose, that she's her perfect Santa?