Exchanged

A twin planet like Earth, in a different galaxy, far far far away from us was not different to Earth in anyway. In that planet exactly the same things happened as what is happening here. Which means, an identical person to me, you and all of us are living in that planet doing what we are doing right now. But there was one difference. The good here is evil in there and evil here is good in there. As obvious there is a One Direction in that planet too who are watching over our 1D guys and trying to exchange the places. The One Direction in that planet is evil. From the look, they are exactly the same. How can we know when we go to a concert whether it’s real 1D or… some aliens from another planet?
Niall, Louis, Liam, and Zayn’s lives depends on a 18 year old girl who fights the Evil to find the boys and save them and bring them back home. The hardest thing was, how can she know whether she brought home the ‘real’ 1D or the evil 1D?
What if we are never going to see the boys ever again?