The imperial physician's daughter Lin Qingran was poisoned by her concubine on the eve of her wedding, only to learn that her gentle fiancé Duan Wang Gu Chengyi had been colluding with her concubine. On the verge of death, she was rescued by King Su Gu Zhao who had returned from guarding the border. She faked her death and became a medical woman incognito. Three years later, he used the draft to enter the palace to take revenge, but his identity was exposed due to his treatment of the epidemic, and he and Gu Zhao were forced to get involved in the battle for the right to inherit the throne. She used a silver needle as a blade to break through the secrets in the back house, and he used a mysterious iron bow to kill the monsters in the court. When Gu Zhao resisted the decree and refused to marry and was imprisoned in the clan mansion to protect her, Lin Qingran uncovered the irrefutable evidence that King Duan had collaborated with the enemy, and finally used the late emperor's edict in front of the Hall of Supreme Harmony to turn things around and protect the country and the world together.
