History's Greatest Prodigal Son

Qin Lingyun transmigrates to the Qian Dynasty and becomes the only son of a salt merchant. At last, he can stop striving in this life. He has envied the life of a rich heir for ages. After the dull entertainment of ancient times nearly drives him mad, he can no longer lie flat. He plans to make a few things himself so he can enjoy life, and invents some little gadgets. But he accidentally takes things too far and catches the current emperor's eye, leaving him with no choice but to get to work and start running a business! Qin Lingyun: I just want to lie flat and be a rich heir who eats, drinks, and waits to die!