Xie Xuan, the founding empress of Great Yan, passed away and her soul unexpectedly transmigrated into Su Jintang, a daughter of a military general's first wife living a miserable life stranded on the border. Having once ruled the inner court and helped stabilize the world, she now has only a frail identity left, yet it cannot hide the brilliant strategy in her heart. Relying on vision far beyond her era, exquisite martial arts, and unique medical skills, she returns to the capital to maneuver step by step through the court's whirlpool. Domestically protecting the young orphan emperor and balancing ambitious powerful ministers; externally foiling consecutive deadly plots and leading troops to quell rebellions on all sides, she stabilizes the tottering dynasty by her own strength alone.