In the Jinyang Dynasty, an imaginary ancient world where the royal family has many heirs but the yang is prosperous and the yin is declining, the ninth princess's eldest son, Li, is actually a man, and he comes with the soul of a modern lawyer. He experienced the death of his younger sister and the mad death of his mother and concubine since childhood, and grew up under the protection of the Empress Dowager. Forces from all sides are fighting to the death for power. Betrayal and exploitation follow closely, and Changsun Li disguises himself as a woman to deal with it. In the whirlpool of intrigues, is he being plotted by others, or is he in control of everything? When his gender is exposed, how will he become the final winner in a complicated situation?