If you guys have seen 'Forever' (which should have been continued) then you won't be amazed with the core concept.

Now I can understand that the makers must have felt these questions daunting them. A lot of others have used it, how to make it fresh?!

So what they did is they changed the climax. But these kind of fantasy stories don't have substantial things to say in the end and THAT'S what they changed. They leave a message which isn't the case usually.