Great Ming: My Son Chongba Actually Became Emperor

Zhu Wusi, who had originally died, somehow spent five years living in the 21st century.

Then he returned to the fifteenth year of the Hongwu era, just as his great-grandson and daughter-in-law were on the brink of death.

So he chases Zhu Chongba around, giving him a lecture, and uses the knowledge he learned in the 21st century to teach his grandson Zhu Biao how to govern the Ming Dynasty.