As you can tell by the number of episodes watched(13/16 at time of writing), I'm having a hard time finishing this show, with about 3~ hours worth of content that I still need to get through to mark it off my list.

The same occurred for me with the shows 'Destined with You' and 'What's Wrong with Secretary Kim, and it's not because I don't like romantic drama series or that those two shows are bad by any means, it's just that all these shows have one thing in common, and that's that their stories are non-existent or shallow.

What baffles me is that this show seems to be highly favored on MDL and I still have to find what is so great about it. The majority of people seem to adore the couple, which isn't strange, but aside from that... if you take away that couple and replace them by literally anybody else, what does this show have to offer? It's a highly forgettable show that has the couple carrying it's entire existence, which is telling as a great show overall doesn't need actors carrying it, as great storytelling and great acting ride the boat together down the stream.

The story is shallow and while it starts off interesting, it becomes more and more frustrating to watch..... At the start she has a disability, after 3 episodes it seems that never occurred or existed, they never talk about it again. There is no backstory on the serial killer, nor is there any information on previous killings, nor is there any reasoning given up till episode 13 on WHY exactly he's so hard focusing on this couple, transcending time and space seemingly to get to them at all costs. The serial killer is 1-dimensional, there is nothing else to the character besides being a serial killer.

Personally I think you can remove the serial killer and the time travel and the series would be better for it, as you would have removed two of the weakest elements of the show.

If I had to give an apt description of this show I would say it's similar to eating a single bland cracker, while it may quench hunger for a moment, it leaves a lot to be desired.

If we're going to compare this to other shows with time travel and/or romance elements my personal opinion is as followed:

Time travel romance better done in:
Mr. Queen
Twinkling Watermelon
Moon Lovers: Scarlet Heart Ryeo
My Perfect Stranger
Chicago Typewriter (Not exactly time travel but timeskips)

Mystery/Crime better done in:
My Perfect Stranger
(Don't recall other shows at the moment, would have to scour through my list of watched shows for that)

Romance/Chemistry better done in:
Gyeongseong Creature
My Dearest
Our Blues (Multiple couples but I'd say this couple the most - https://www.youtube.com/watch?v=N_xuO7s06Tc)
Chicago Typewriter
Tell Me That You Love Me