Deokman was born a twin but was abandoned as a baby and sent to a place far away by her father, King Jinpyeong in order to protect her from being killed by an influenced 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 Cheonmyong to oppose Mishil. However, Mishil devised sinister plans to have the two Silla princesses exiled from the kingdom, and in a secretive battle, Princess Cheonmyong 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.