Dukman (Lee Yo Won) was born a twin but was abandoned as a baby and sent to a place far away by her father, King Jinpyeong (Park Ye Jin) in order to protect her from being killed by an influenced royal court lady, Mishil (Ko Hyeong Jeong) who tries to snatch away the throne from the royal successor. Dukman 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 Dukman shrewdly enlisted the help of General Kim Yusin (Uhm Tae Woong) and eliminated her archenemy Mishil. She then became Queen Seon Duk, 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.