Dressed as an orphan in a small village in the Qin Kingdom, I made a living by hunting and selling meat. When I got drunk, I bragged that I could be richer than a prince. Three days later, Meng Tian came to the door and dragged me into Xianyang Palace: "This kid said he has the ability to make Qin ten times richer. Your Majesty, please review." Ying Zheng stared at me: "Tell me, how do you get rich?" I pointed to the bronze on the table: "Your Majesty, let's replace this thing with iron, and save half of the military expenses first."