It was a novel that traveled through the Republic of China and used high technology to revitalize China.

The main character came from the modern world or the future. For unknown reasons, he traveled through the Republic of China and developed high-tech and established a powerful army. Of course, there had to be some important historical figures in the plot, such as Mao Ze Dong, Zhu De, and Zhou En Lai, to let them have their views on the main character...
It could be worn alone or in groups.
At present, I only know about "Reappearance of the Han and Tang Dynasties" and "One Man's Resistance to Japan".

Answer 1

This type of novel was more common, such as Back to the Republic of China as a Warlord, Gone with the Wind, and so on. These novels usually depicted the protagonist using high-tech means such as military weapons, communication equipment, medical technology, etc. to revitalize China and change the course of history.