Modern infrastructure engineers were transformed into prisoners of the Qin Dynasty and were forced to participate in the construction of the Great Wall. He originally wanted to live a happy life, but he was targeted because of his concrete formula. The supervisor asked him to improve the technology of ramming earth, the general asked him to design the equipment for defending the city, and even the censor from Xianyang came to him to ask how to pave the "highway". Until one day, an urgent report came from the beacon tower - the Huns in the north were moving, and the drawing he had just handed over contained a complete fortress defense system.
