S1, A1: Prince Yeoning is a prince discriminated against because of his mother's peasant background. He returns to Hanyang to support Prince Yeonryeong take the throne against the tyrannic Prince Milpoong, who would do anything to take power. The Saheonbu is determined to uncover Prince Milpoong's crimes and bring justice to the kingdom. The power struggle between the Patriarchs and Disciples is just beginning.