Gong Ah-jung (Yoon Eun-hye) is a government employee of the Ministry of Culture, Sports and Tourism. At the beginning of the series, Ah-jung lies to an antagonistic friend about being married, not to lose face in front of her. The lie quickly snowballs (due to several misunderstandings) until Ah-jung realizes that everyone is gossiping about her supposed, secret marriage to Hyun Ki-joon (Kang Ji-hwan), the very wealthy president of World Hotel.
As the gossip spreads, a miserable Ki-joon is forced to combat the rumors to his friends as he decides a plan of action in getting Ah-jung to correct her lie. Ki-joon and Ah-jung decide to take action to squash the rumors, with Ah-jung agreeing to call her friends together so she can confess her discretion. When this doesn’t go as planned, Ki-joon decides to take legal action against Ah-jung. However, after a series of events that bond the pair, they agree that pretending to be married for a short while would be mutually beneficial—though Ki-joon promises that Ah-jung’s lie is not forgiven and that he will eventually follow through with his lawsuit.
Things become even more complicated when Ki-joon’s ex-fiancée returns from France. Ki-joon and Ah-jung grow closer and fonder of one another over the duration of their pretended marriage; Ki-joon finds himself questioning his commitment to his former fiancée Yoon-joo.