Three years after the dynasty fell due to a revolution, Princess Lien, who had been imprisoned underground, enters into a political marriage with Duke Rishan of Rochenoir by order of the Empire's emperor. Whenever the stigma of others targets her, Lien sinks into the abyss she created herself. Through his love and solidarity, she faces her true self and finally realizes that promises and trust are stronger than fate, and that they were each other's most brilliant return, walking while looking at the same star.