Responses

I think that guy will come later, maybe as a new student but I don't think he's the boy with orange hair, if you search on the internet there's a cover with the protagonist and the two rivals, but there's also a third character who can be seen from behind, I'm very sure that he's the rejected boy and he'll be the third rival
I think the guy in Iltak's flashback (the one who confessed to him and ended up getting bullied by him) is actually the orange-haired guy. It makes perfect sense and would explain his fixation on messing with Iltak. I can almost TASTE this reveal, bro! ( ̄¬ ̄)