Hyun Ki-joon (Kang Ji-hwan), the highest noble in the Republic of Korea, not only has good looks, wealth, knowledge, and fashion taste, but also has the self-esteem, sense of responsibility, education, and etiquette of a noble. Moreover, as the representative director of a large hotel group, he is the prince charming in the hearts of almost all women. Kong Ya-ting (Yin Eun-hye), a fifth-level civil servant in the Hotel Culture, Sports and Tourism Department, is an extroverted and a little cheeky. The two people who were originally unrelated and could not be together were helplessly involved in a marriage scandal because of a ridiculous lie that Kong Ya-ting accidentally blurted out. From then on, the fate of the two people who were completely opposite to each other was intertwined. And Hyun Ki-joon's younger brother Hyun Sang-hee (Sung Jun) fell in love with this boyish fake sister-in-law and secretly pursued her. Similarly, Hyun Ki-joon's ex-girlfriend Oh Yoon-joo (Cho Yoon-hee) came back from Paris and couldn't forget him, so she started a battle for him. What unexpected ending will this emotional battle between the four people have?