Lin Mu, a modern military engineer, was struck by lightning during a drone test on a plateau, and his soul traveled to the body of a down-and-out craftsman in the "Great Xia Dynasty". Although Daxia was prosperous on the surface at this time, in reality its metallurgy was backward, farming relied on the sky, water conservancy was in disrepair, and border troubles were constant. Lin Mu relied on his modern engineering knowledge and started with an improved iron plow, igniting the technological tree of the entire dynasty and setting off chain revolutions in farming, metallurgy, military industry, transportation, energy and other fields. At the same time, his personal life also unfolds within the ethics of ancient society - a child-marriage that he has chosen since childhood, several women who are impressed by his ability, and the company of his maids, all together weave a warm and complex family network. He only wanted to improve people's livelihood, but unknowingly, he rewrote the civilization process of the world. In his later years, he compiled what he had learned throughout his life into "Tiangong Kaiwu" and spent the rest of his years with his wife, concubines and children.
