A Weapons Tycoon Transmigrates to the Qin Dynasty

The uncle of a history collector guards an ancient secret. Having no children of his own, he hopes his nephew will inherit it.

But his nephew has no interest whatsoever. He only cares about developing weapons: more newfangled arms and more money. That's his only pleasure.

Then, while the ancient secret is being passed down, something unexpected happens. The nephew transmigrates.

He arrives in the late Warring States period.

Heh, when in Rome, do as the Romans do. He's a weapons expert, so dealing with cold weapons should be a piece of cake, right?

You have cavalry? I've got machine guns. You charge, I'll lay mines and string up barbed wire. You flee? I'm an expert. I've got tanks and armored vehicles on the ground, and planes in the sky. Surrender!

What could be better than using mechanized weapons on an ancient battlefield?