Transmigrating to Republican-Era China! My Clones Build a Superpower Underground

The rating is a little low since it just came out, but don't worry, it's an enjoyable read. The premise is refreshingly original. Don't miss it as you pass by!

I transmigrate to the Republican era, and I'm an eight-year-old kid, too! This is a hellish start from the start!

Luckily, I have a doppelganger System. I can stay home and enjoy all the meat I want, even in a poor rural village.

Using my System doppelgangers, I dig out an underground world. In my spare time, I can even travel around the globe through them.

What! The underground spaces I excavate count as unclaimed territory.

And I get points for claiming them! Just give me time, and I'll build a whole new world.

What! I dug north, and there's still a war going on up above. Send the doppelgangers up to give the Japanese a little trouble.

What! Upgrading my animal doppelgangers lets me do research, too!

The underground world has reached the 21st century, while the surface is still stuck in the 20th…