An ordinary office worker, ‘Han Da-yeon’. In order to successfully arrange the company’s life or death project, at the request of the CEO of a venture company, as well as her former classmate, ‘Lee Ji-an’, she became his secretary. To work from home with the guy who ruined her first kiss back in high school! But, Da-yeon finds out that she was Ji-an’s first love, and as Ji-an doesn’t hide how he feels, the two get closer…