I Sell Tea Eggs and Missiles on the Side. What's So Unreasonable About That?

A year ago, Chen Yue transmigrated to this parallel world. The body's original owner was a down-and-out college graduate who sold tea eggs outside a factory. Chen Yue thought he would get a tycoon System, kick off a life with cheat-like advantages, and enjoy luxury cars, villas, and beautiful women at his side. There really was a System! But the one Chen Yue got was called the “Ultimate Hand-Built Master” System. Making all kinds of high-quality seamless steel pipes was his specialty! What? You say those seamless steel pipes could have fancier names? Gun barrels, cannon barrels, and missile casings? Well, for an egg seller like me, selling missiles on the side is perfectly reasonable, right?