He turned out to be a sickly and weak young master of the Qin Dynasty, but his life was not as good as that of a weak crown prince. The Yin Yang family wants to make fun of me? Father, do you think I am useless? But when I woke up, I found all the knowledge about military industry in my previous life! Making repeating crossbows and refining refined steel, it's time for me to take the helm of this great Qin country.
