Lin Yuan, a science-and-engineering graduate, transmigrates to the Tang dynasty and becomes a poor young man from a humble family.
No System? A good brain is all I need. I make steel with coke, defend cities with gunpowder, and change the course of history with steam engines. Using modern technology, I rebuild the Tang dynasty from the ground up.
But technological superiority isn't the hardest part. The real trouble is this:
The Crown Prince is about to be deposed, Prince Wei is about to rebel, and the princess's brothers are all heading down a dead-end road.
And the girl known as Princess Changle is standing atop the city wall, beating a war drum for him:
"Lin Yuan! You have to come back alive!"
He looks up at her, then down at the Great Tang beneath his feet.
All right. Since I'm here, I'll change the will of Heaven.
By the way, why do all this princess's younger sisters call me brother-in-law?
The AI looks very nonsensical and out of touch.