Li Jingheng, a famous surgical doctor, traveled through time in a car accident and became a dying rural drug boy during the Zhenguan period. Bringing modern medical knowledge to the Tang Dynasty, he corrected fetal position, treated trauma, and prevented plague, and used his unique skills to move from the countryside to Chang'an. Breaking problems with medicine and settling down with skills, in an era when there was a shortage of medical treatment and medicine, he saved all people from illness, helped stabilize the foundation of the prosperous age, advanced step by step, and finally became the medical sage of the Tang Dynasty, writing a legend of a doctor that spans time and space.