The seventh prince of Yan Dynasty, Murong Zhao, was falsely accused of treason because of his mother's Zhenbei Hou Mansion and was imprisoned in Cold Spring Palace for ten years. Yuye accidentally rescued the former Queen Shen Qingci who was deposed as a commoner, and discovered that both of them were related to the conspiracy of the remnants of the former Qi Dynasty - Murong Zhao's mother clan was framed by the remnants of Qi, and Shen Qingci was framed for exposing evidence that the remnants of Qi infiltrated the palace. The two worked together to plan the plot. Murong Zhao used his wit to win over his old subordinates, compete for military power, and resolve the pursuit of the prince; Shen Qingci used his status as a deposed queen as a cover to use medical skills, organizational skills and historical knowledge to solve the palace mystery. In the process, they encountered betrayal from allies, drug traps, amnesia crises, and even uncovered the secrets of Daqi's treasures and bloodline that had been hidden for centuries. In the end, the usurping prince was overthrown, and the ultimate conspiracy of the remnants of Qi was revealed. Murong Zhao ascended the throne as emperor, and Shen Qingci was restored to the throne, jointly creating a prosperous age for the Yan Dynasty.
