Lin Mo, a third-year clinical medicine student, accidentally traveled to the Tang Dynasty in the twelfth year of Zhenguan. As soon as he woke up, he encountered a critical situation in the inn where the waiter's wife had a difficult delivery. With the knowledge of modern obstetrics and gynecology, he used scientific first aid techniques to stop bleeding and correct the fetal position, successfully saving the lives of mother and child, for which he was appreciated by the minister. After that, Lin Mo used modern medicine to solve ancient problems such as plague and surgical emergencies in the Tang Dynasty, which was short of doctors and medicines. He broke the limitations of traditional medical skills, gradually gained the trust of the powerful, and became a wealthy man. Finally, with his achievements in saving lives and healing the wounded, he wrote a legend in the prosperous Tang Dynasty that the successor of Western medicine will go down in history.