The protagonist, once an Assistant Manager on the Spain team at Daeyoung Trading, has his accomplishments stolen by his superiors and is pushed out to the Distribution division. There, he begins working as the executive secretary for Managing Director Kang Munjeong, the sole legitimate heir of the Daeyoung Group.

With her own position under threat, Managing Director Kang Munjeong proposes a contract marriage to the protagonist, Yoon Taesik, who has served her for three years. The goal is to draw the public's attention back to her and turn him into the male Cinderella of the century...

The price for this marriage: 10 billion won.

An office drama unfolds as the protagonist, promised 10 billion won, begins to carry out the various clauses of the contract marriage.