He had never asked to be summoned from the outer realm in the first place.  Nor did Byunghyun ask for his Summoner to die before sending him back, making him a 'rogue' Eidolon by default.  And he certainly hadn't asked to be captured by the Mage Guild where he was subsequently bound to the recently blinded alchemist Minsoo. But Byunghyun learns that sometimes, what he doesn't want ends up being just what he needs.  Or at the very least, it ends up being much better than he ever though