In the early years of the Republic of China, He Changsheng, a young man, followed his grandfather from childhood to travel around and practice medicine to save people. He learned a lot of skills. After his grandfather passed away, he and his childhood friend Hu Yifa went to Shanghai and opened a small medical clinic to practice medicine for the people. Until one day, when He and Hu were managing the shop, a woman dressed as a Miao came to the door and asked He Changsheng to "pay the father's debt" and fulfill his promise. He Changsheng and Ah Man had an argument for no reason. Just as the two were arguing, a man named He Renjian appeared with a team of foreign mercenaries and surrounded the clinic...