Su Jinyan, the legitimate daughter of the Duke of Zhenguo, was framed by her stepmother Liu when she was a child, and she suffered in the countryside for ten years. After being taken back to her home, she no longer tolerated the difficulties faced by her stepmother, the jealousy of her concubine Su Yuran, and the indifference of her father. With his superb medical skills, he rescued King Jing Xiao Jingyuan, used his extraordinary strategy to expose his stepmother's conspiracy, and gradually regained the power of the housekeeper and recovered the dowry. Xiao Jingyuan fell in love with her at first sight and supported her: "Who dares to touch my people, ask my sword first!" There is no golden finger, only mutual trust and protection. Amidst the treachery in the deep house and the turmoil in the court, Su Jinyan counterattacks and becomes a noble girl in the capital. She and Xiao Jingyuan compose a sweet legend of the return of the legitimate daughter and the prince's doting on his wife.
