Era background: At the end of the Tang Dynasty (the third year after the outbreak of the Anshi Rebellion), after the fall of Chang'an, the Guanzhong region fell into the end of chaos, with feudal vassals and towns separated, refugees everywhere, plagues spreading, food shortages frequent, and the once prosperous cities turned into ruins and a desperate situation intertwined with battlefields.
Protagonist: Wang Dan, 22 years old, a junior majoring in modern clinical medicine. He is good at basic surgery, infectious disease prevention and control, and first aid. He has a calm, pragmatic personality and strong adaptability. He has slight social anxiety but is very responsible in crises. Before time travel, he was participating in a hospital emergency internship.