Deokman was born a twin but was sent to a place far away by her father, King Jinpyung in order to protect her from the royal court lady, Mishil who tries to snatch away the throne from the royal successor. Deokman was later brought back to the Silla palace, where she joined forces with her twin sister Princess Chunmyung to oppose Mishil. However, Mishil devised sinister plans to have the two Silla princesses exiled from the kingdom, and in a secretive battle, Princess Chunmyung was accidentally killed. But Princess Deokman shrewdly enlisted the help of General Kim Yusin and eliminated her archenemy Mishil. She then became Queen Seon Deok, the first female ruler of the Silla kingdom. This drama is about a story of a beautiful queen, who has to give up her love to save the people and thus, leaving behind many brilliant achievements.