Remember Hansoo has already met the real king of the evlvehiem fforest and that one is just an imitation, sure they’re of elven race but he is not the actual king, and also seeing as how ha soo knows the tekron guys name, he has met his actual body and not the body created in that world they’re currently fighting in.
So truth be told I don’t remember the previous chapters you’re referring to but assuming from your theory he might actually be a apart of the royal lineage inf the Evelyn forest but I’m not entirely sure since the two are similar since they’re interconnected only the imitation has it’s limitations due to being created by the system.
WAIT THEORY, IN CHAP 75(?) THE BLUE ELF SAID HIS NAME IS TEKIRON, WHICH IS SIMILAR TO TEKILON (85), THE ELF KID'S DAD... COULD HE BE THE COPY OF THE DAD???? AM I TRIPPING