Not 3. Most likely 2 authors. The first author came back and he was kinda decent. The middle part of the book is a mess(2nd author's).

As for characters he was going to confront from the middle part(2nd author's) it was written as notes that those characters won't be mentioned and the author resolved it(by notes). This novel was translated by webnovel, and the translator never bothered to translate those notes(relevant to the story? who cares).

With this said, this story would've been kind of decent if the original author wrote it fully.

But take it as a good lesson as never to trust anything from webnovel.com. There are even novels that were written by the translator themselves(instead of translation - using author's good name ofc) - they just jump back to the original story(in the middle) making the whole novel prizeworthy crap of shit.