In 21st-century South Korea, ruled by a constitutional monarchy, Seong Hee-ju (IU) is the youngest daughter of a powerful chaebol family. Beautiful, brilliant and extremely competitive, she seems to have it all... except royal blood. While this hasn't bothered her up until now, her commoner status is gradually starting to close doors.
It was then that she crossed paths with the prince Yian (Byeon Woo-seok), the king's second son. Although he holds a prestigious title, Yian is entitled to nothing. Invisible to the world, he lives in seclusion... until he meets Hee-Ju, who changes both their destinies.
