"I've met...a couple versions of the same person, yeah." It's not like Boss Monsters are ridiculously common enough for there to have been a mix-up - or that "Asriel Dreemurr" is a regular enough title. "Each of them kinda with their own set of experiences. Some were somewhere else first. Some weren't."

And for the sake of privacy, he's very purposefully not disclosing the specifics.

He's violated the poor kid enough.