The heavy snowfall of the third year of Jianwu covered Nanyang County. The old doctor Zhang Bozu was sorting out the scraps of medical books recovered from the ruins in the cold wind. His hand that coughed up blood was still holding the bone knife tightly, trying to repair the medical wisdom that had been burned by the fire of Qin. Zhang Zhongjing, a young man, brought astragalus and ginger soup and listened to his master telling about the survival codes hidden in plants and trees - ginseng, which is said to be cold-resistant by hunters, Dipsacus astragalus, which is used by veterans to set bones, and astragalus, which is used by ordinary people for daily use. They are all passed down orally among the people, but they are facing the crisis of being lost. The two masters and apprentices decided to use bamboo slips as matchmakers, one to identify the nature and flavor, and the other to remember how to use it. In the wind and snow, they saved a continuation of the fire for the wisdom of life hidden in the vegetation.
