It's The Ring!

As good as the King's plan was, both Dan and Bella understood that changing even the slightest event in history had the power to change everything in the future. And that was completely unacceptable. Who knew if marriage between them was going to complicate things further? They needed to find another way around things that wouldn't involve them changing anything. The only problem now was that they had told the King everything, and that meant he could make moves he wasn't supposed to make without even telling them.

Dan turned to look at Bella, and she shook her head slightly, and he nodded in understanding, "We understand that you are trying to fix things, but I don't think that is a good idea," Dan said after some time, making the King look at him with a puzzled frown.

"Why not?"

"Because that would be changing the entire course of history," Dan explained.

"Yes. But we would be changing history for the better," The King pointed out.