Hong Rang was born into a wealthy family and was the successor of a large merchant association in Joseon, but suddenly disappeared at the age of 8. His half-sister, Jae Yi has never given up hope of finding Hong Rang. Her arrogant mother Min Yeon Ui, the most powerful figure in the merchants' association, has had a difficult time since her disappearance. After 12 years, Hong Rang returns, but she does not remember anything before her disappearance and also carries a secret with her. Jae Yi suspects that Hong Rang is not the real Hong Rang and she is attracted to him.