Both have romance and a mom who is dead in the future who the female lead tries to save.
Go Back Couple is about a married couple and wanting to go back because of marriage problems and it also tugs more at your hearstrings while Reset Life is a more lighthearted version of Go Back Couple. Both are well crafted dramas that don't drag at all. Both short and sweet. Go Back Couple is 12 episodes while Reset Life is 5 episodes. Go Back Couple obviously has more depth since it has more episodes to develop it but nonetheless both are amazing dramas that you must watch.