The unknown place could be somewhere their both not supposed to go. Like a forsaken garden. It's abandoned and should never be entered, you know? But they meet there, and aren't used to seeing someone so different so it's almost love at first sight kind of thing. They so attached by each others differences that they could go to a guardian and ask about it. And when they're are told the undying truth of the other " species " they feel more conflicted to meeting each other. As they meet each other more often, they realize they aren't so bad as the stories make them to be. But their love for one another isn't allowed. It's forbidden.