A tragedy makes the people who Hyoyeon's loved forced to executed by the Kingdom, even though those people are actually innocent. Hyoyeon promises that she will avenge her on those who have killed her family. Although her form of revenge is kill one of the members of the kingdom. 

Hyoyeon  is not a stupid girl, she's even very smart. She plans to trick the Crown Prince, Jongin, by taking part in the royal wife's election for the Crown Prince. Until luck was in her hands because not long ago she can escape the election and become a future wife of the Crown Prince. The plan was almost successful, before suddenly she met directly with  the Crown Prince, a person who was able to turn her heart.However, Hyoyeon stills on her decision, she will still kill the Crown Prince.

Until hundreds of years later, reincarnation happened and Hyoyeon and Jongin were born again. Hyoyeon was reborn to be poor girl who needed money so much that she must  work as a cleaning service at a large company headed by Jongin.
And Jongin became the figure of a handsome CEO who is famous for his responsibilities and leadership so as to transform his small-scale company into an international scale.

And again the fate made they met each other. When they are intentionally reunited by destiny, making them know each other again.