Li Feilong, a modern medical doctor, unexpectedly transmigrates to the early Hongwu era and takes over the body of Liu Jing, the third son of the Marquis of Chengyi, Liu Bowen. He awakens the “Historical Warning System.” Wielding modern medical knowledge like a blade, he stirs up a storm in the treacherous early Ming court.
He treats Empress Ma's carbuncle and revolutionizes surgery; on the battlefields beyond the northern frontier, he pioneers a triage system; and in the mysterious poisoning of Zhu Xiongying, he identifies the culprit through forensic examination. The System gradually awakens the “Green Satchel Immortal Art” from its basic medical template, helping him compile the Hongwu Medical Canon and establish the Ming Imperial Medical Academy, while bringing cowpox inoculation to the entire country.
Caught in the vortex of power, he wins Zhu Yuanzhang's trust by offering him a penicillin formula, and helps Liu Bowen grow from a stubborn scholar into a key reform minister. During the northern campaigns, portable disinfectant kits save a hundred thousand soldiers; when plague breaks out in Nanjing, his vaccine turns the tide. When the conspiracy of Zhu Yunwen and the Lü clan is exposed, he uses microbiological evidence to put an end to the interference of imperial relatives in government.
Over fifty years, Liu Jing grows from an inexperienced youth into a revered physician who safeguards the nation. But on his deathbed, he discovers that it was all a modern VR simulation of history. He was, in fact, the “Historical Corrector” chosen by Zhu Yuanzhang. After waking, he records his experience of transmigrating in The Long Dream of the Green Satchel, letting ancient medical wisdom and modern technology intertwine forever on the page.
This novel reconstructs Ming history through the lens of medicine, weaving modern ideas such as battlefield first aid, forensic examination, and public health into the prosperous Hongwu era. Through the visual interface of the “Historical Warning System,” it presents the parallel analysis of diseases and the projection of historical events, composing a stirring song of saving the nation through medicine amid political struggles.
