You -Lee Jieun, a smart young lady. You're busy at work, to be a successor of your father's big company in Seoul. You like it because you're a workaholic indeed. Wherever and whenever you go, there will be Chen -your brilliant assistant. It has been a year for him since he become your assistant. You two work hard together and sometimes tell jokes each other like friends.

But there are times when problems come to both of you. What would you do with your stubborn thought? Will the mystery of your problem solved??? And what will happen next...?