In a time of hatred and despair, words become swords that wound one another. In the end, those swords point at the hearts of the sword-bearers themselves. The modern world faces such harsh realities, but so does the world in which this drama takes place. This is the story of the great kingdom of Goguryeo and the daughter of the 25th king, King Pyeongwon. Princess Pyeonggang is born royal, yet she is raised by humble folks. Despite the droves of enemies vying for her life at any moment, this fierce woman never gives in nor loses strength. Even amidst calamity and political strife, she remains steadfast to protect the ones she loves and her beloved kingdom.