I would love it if they were plucked from their stories and put in the real world, but, that could have happened when they were babies. Then we could play up the "destiny" part, with them having some kind of bond to their story even if they didn't grow up in it. That would tie them back to the fairytale world and give a sense of purpose when they find out the truth. Then they could experience dreams or flashes of what their stories should have been instead of actual memories... Just brainstorming this on...