This novel may make everyone feel that it is a bit of alternate history and a bit of fantasy. If you feel bad, please forgive me and don't criticize me.
The modern time traveler Zhu Xi traveled to the 14th year of Hongwu in the Ming Dynasty. At that time, Zhu Yunxi was three years old. After receiving systematic help, he went to the fiefdom to build a modern city at the age of three.
It's well written and has a modern feel.