The emperor constantly thought about what he did to the inventor, he tried recreating the flying invention the inventor and failed hundreds of times. He wish he didn't kill the inventor so he could use the flying machine to invade other countries that are currently building walls.
The emperor tried to recreate it by using the shapes he saw on the flying invention but he could never recreate it to work the same way the inventor made it.
Even when dead the emperor of China still thought about recreating the invention that the inventor created. He tried to death to try to recreate what the inventor made.