Protagonist: Shen Yu (Doctor of Modern Medicine/Attending Physician in the Emergency Department) Pre-time travel identity: Attending physician in the emergency department of a tertiary hospital, 32 years old. He is good at trauma first aid and surgery, and has in-depth research on epidemiology (which can explain why he can both perform surgery and understand epidemic prevention). He is calm, decisive and has strong professional beliefs. Time travel method: It is not a "death time travel", but a hospital fire occurred while rescuing a critically ill patient. When he woke up, he found himself lying in the wounded soldier's tent in an ancient military camp, with the body of a young wandering doctor who had just been drafted into the army. Cheap finger design (restrained version, to avoid being said to be "too ruthless" by readers): no system, no space. The core competency is the modern medical knowledge system: anatomy, aseptic operation, antibiotic principles (can make simple antibacterial herbal preparations), infectious disease prevention and control logic, and battlefield first aid procedures. There is also a "knowledge-based" advantage: a certain understanding of toxicology, which is a hidden trump card in the political arena. Character arc: From "I just want to live and only heal the people in front of me", to "If I don't stand up, more people will die", to "Doctors heal people, but they can't heal this rotten court - so I choose a person who can heal and help him get up."
