
This is just a theory I might be wrong, I dunno... but in chapter 9 it talks about the God of Death was in love with the God of Moon and all humans hail them, but there was this jealous human who didn’t approve of it and killed the God of Moon(?) That jealous human became a vampire (which I’m assuming it’s that white haired vampire since he is a pure blood and is one of the oldest vampire) and the God of Death curse the humans saying that there will be a man of Moon and a man of Death, once they become one he will return, remove the curse and take back the man of Moon. I’m basically just summing it up so it’s not a theory... but I still might be wrong ahah, hope this helps
So the black haired dude is the man of the night? “Cain” is the man of the moon and that vampire dude is the first vampire who was a jealous human... huhh... looking forward to the future chapters (▰˘◡˘▰)