Su Wan, a future medical doctor, travels back to the abandoned female doctor in ancient times and relies on future medical knowledge such as anatomy, microbiology, and surgery to solve difficult and complicated diseases such as dystocia, plague, and trauma that cannot be dealt with in ancient times. In the process, she overcame the obstacles of feudal ethics, the jealousy of peers, and the difficulties of the powerful. She counterattacked from being a retired female doctor to become a national doctor, promoted the reform of ancient medicine, and fell in love with Gu Zhao, a great scholar of the dynasty, and finally realized the story of world health.