Ji Won became a concubine of Ji Chang Wook. After the primary empress Baek Jin-hee was executed in a purge because of the rebellion of her brother Jung Hyun. And because of her jealousy towards other concubines that resulted on killing them.

Ji won was from a noble family a loyal subject of King Seong, Ji Chang Wook's father. Being a royal subject wasnt that easy. Her father was framed up by the governors of being a traitor. And was sentenced to death. Her parents died when she was ten years old and was force to live as a commoner.

Ji Won promised herself to avenge her family. She will do everything even if it means killing her husband the king. Can she really do it? Is it really the royal family who killed her family?