Who is Killian?

My exact question

Camping here incase someone will tell who he is

I thought I was the only one confused about the name

I’ll be here till someone knows (=・ω・=)

Yeah who's he

One of the original route, he's son of the Duke whose friend with Nasar

I got it wrong Killian is the Empires Hero, the son of count. He appears at chapter 61, the one who dance with the fake ellencia