Lin Fan started as a victim of the Yellow River disaster and gradually accumulated capital through first aid, gunpowder improvement, financial manipulation and other means, and secretly laid out the technology tree: improving firearms, monopolizing salt and iron, promoting high-yielding crops, and even using psychology and chemical warfare to deter opponents. He and Zhu Chongba went from being sworn brothers to being suspicious of each other. They not only helped his rise, but also ensured the continuation of the technological fire by laying foreshadowings (such as Zhu Di's training and secret files in the underground palace).
