Damn what?
Wait really? Where did it say?
If you read chapter 1 of the official release, at the end of the chapter, you will see a sentence that reads "This work is dedicated to the author of the original work, the late Dugo". And the person who let us know that Dugo passed away was their best friend, I think. I don't quite remember who it was exactly. It was shown at the comment section of the manhwa app. I'm not sure which one it was tho (Tapaz, or maybe the other one).
And we don't know exactly yet if it's the artist who continues the story of if it's another author.
It's a side, because author di-ed before they could finish this manhwa. Someone else is working on this manhwa right now, and that's why we have a side. They could name this a season 2 of the manhwa, but they want to honor the og author. Hence why we have a side, rather then a season 2.