Princess Pyonggang is completely alone: her mother died several years ago, her father is infatuated with the young favorite, and powerful clans are intriguing, trying to deprive the young princess of power. However, she is not going to give up. Remembering the lessons of his late mother and using the full power of his extraordinary mind, Pyongan learns to win supporters and confront enemies. By chance she meets a village boy, Ondal, who shows the princess a completely different life, far from the bustle of the court. And when Pyeonggang has to make the most difficult choice of her life, she remembers Ondal.