I Became a Founding Father at the End of the Western Han Dynasty

In AD 22, three astronomical phenomena tore apart time and space. Zhang Qi, a doctor of history and military engineer, traveled together with 36 people from the Qinling Observatory and landed on the Kunyang battlefield in the physical body. A nine-star birthmark appeared on the palm of his left hand, and the time and space knowledge base was unlocked in his mind - a two-hour limit per day, and the technology output needed to be "adapted to the Han Dynasty". To survive in troubled times, he built cities with cement to help Liu Xiu defeat the new army; when the world was uncertain, he built Tiangong camps, introduced farm laws, and established a medical system. But history has its own power of correction: if technology crosses its boundaries, natural disasters will occur more frequently, and if it changes too much, memories will become blurred. The lessons learned from Wang Mang's radical reforms and the tragic lessons learned from the infighting among time-travelers such as Liu Xuan made him understand that in this era, the greatest wisdom is not what can be made, but what should be made. From a technology provider to a system builder, from an ethical awakener to a guardian of inheritance, Zhang Qi is looking for a destination in the four-dimensional emotional matrix: he resonates with Yin Lihua's spirit but is more emotional than polite, he is attracted by Guo Shengtong's intelligence but loses due to his political stance, he is free and easy and happy with Ashina, a businesswoman from the Western Regions, but they part ways, and finally he stays with the medical girl Tang Wu in life and death. When the world was unified, he took the initiative to retreat to southern Yunnan and founded Xinhuo Academy. The gunpowder formula and steam engine sketch sealed in the iron cabinet were left behind, with a warning on the title page: "If future generations use it, they should think: Why do you want it?" This is a time-travel epic about technological ethics, historical responsibility and emotional destiny. It not only talks about how to change the times, but also explores how to let go after the change and let the power grow gently and continuously.