So this work throws a bunch of terms that newer readers might not know. If you have seen any of the Korean Modern Day Gate/Ranker/Hunter works, you may know some of them. The prologue is a proper one that sets the scene, but from how it reads in comparison to the first chapter I think they were made at seperate times with the prologue's original purpose being a preview that sets the scene and spoils knowledge from the first chapter..... But yeah technically chapter 0 should be read first, it'll just feel awkward as hell