Restoring the Later Zhou Dynasty

In that era, there were very few people who could defeat Zhao Kuangyin in a one-on-one fight, even among the Later Zhou, Northern Han, Southern Tang, and Khitan dynasties.

It would be good enough if they didn't get stunned by a set of long punches, let alone beat up Zhao Kuangyin?

I don't quite understand why Zhao Guangyi is on the cover of the book "Supporting the Later Zhou Dynasty".

As the protagonist was thinking, he suddenly realized that the other person had a grudge against his father.