Warring States God of War: Why Is Mao Japanese?

On a whim, let's watch it alive✧٩(ˊωˋ*)و✧ To make up the number of words, I originally wanted to name the protagonist Yu Fei, but it seems that this surname does not exist in China... Let's just say... Is it possible that Xu Fu is their ancestor? My literary talent is limited Regarding the content of the work, if you want to read the battle chapters, I suggest you jump directly to chapter 25 and start onwards. The first twenty-five chapters are just to let Yu Fei know what he is fighting for!