The first 2 episodes didnt really get my attention but once I was finally hooked, I absolutely loved the ride.

The plot is not very original, even with the other dimension concept, it's something that has already been done. But despite its lack of originality, I found the story very well paced and written. Even though I already knew what was coming, I still very much enjoyed watching each episode and the process of finding the criminal.

For the romance part, some said it was only subtle but I disagree. It's not a romcom and you dont get to see the whole "fall in love" process but instead you understand how much they belong to each other and are already each other's family mainly through the ML memories. I found it maybe a little exaggerated for drama purposes but very moving at the same time. And I love how respectful the ML was to seo kyung from the other world, how he loved her without forcing his memories on her.
It was a breather from all the romcoms in which the ML pretty much forces his feelings on the FL

The ML actor carried this whole drama because the writing totally emphasises his perspective and introspection, I would have maybe liked to explore a little more the other characters, they were too simply depicted in my opinion.

Overall, i found it very entertaining and the OST stays in your head as well; the whole concept of the butterfly effect and how every action has a huge impact on a possible future was well used too. So as a big mystery/crime drama fan, I recommend!