To Every You in 2017

By warping the space through a drive, time travell is actually plausible, specially through a drive that can contract the space in front while expanding the space in the back, theoretically, the travel speed of that drive exceeds the travel speed of time.

A group of scientists managed to create a functionable time machine, yet it caused a major chaos in all of the existing timeline causing dilemma after dilemma.

What are you willing to sacrifice in order to be with you lover again and again and again? Saving all the existing timeline.