I love that they used a novel as the source material for this show because books spend more time on the emotional arcs of the main characters. This one is worth watching for the last few episodes...but...but

But, here some things got lost in the translation from three three-dimensional characters in a novel to what we see finally from one of the main characters...

let's call it a basic-b syndrome or a cardboard cut-out of a closed heart and true hating of anything related to happiness. I'm being kind here...

It could be the casting. I read one of the leads was recast at the last moment. Or they used a shredder to the original concept and improvised the worst parts of a selfish human being and did that for a few episodes. I'm complaining because I like the concept, and the actors are good...

You can punch holes in the rules of time travel and probably when things finally get to a hint of romance. I have questions about how one of the characters magically becomes less dumb.

Why was I yelling at the screen at the actions of one of the leads (no spoilers)...but you will know what I mean when you see it.

That's the big question: will you stick with it and get to the good parts? YES, I believe in time travel and I've seen your future. You will have to see how it ends. And that's why I grudgingly give an overall 9 out of 10 because I have NO choice.