Short: Good action, nice "fish out of water" type storyline with the detective displaced in time with some of the humour that brings, as well as the contrast in various aspects of the two time periods. The ending is solid, but I thought it missed a couple of nice final moments that would have just been a perfect bow - but that doesn't negate the overall solid state of the story. Great acting, great cast. Definitely worth the watch.

Detail:
There's some great moments in this with the detective being a bit of a "fish out of water" as he's displaced in time, as well as struggling with being a great distance (in time) from his wife. The chase for the murderer is really good and works generally well with some trips to mislead the viewer until things shift into top gear for the final apprehending of the killer. I thought those aspects really worked well.

There wasn't anything that I thought worked badly, it was entertaining throughout - though I think Lee Yoo Young might qualify for the most strangled woman in a drama now though, I mean, you've gotta have a need for some psychiatric help after this story is over if you're her, surely.

Literally the only thing that I thought was missed was at the end - a couple of nice scenes could have been really good here - but i'll leave it for a spoiler comment in a moment to discuss the detail, so that this does not spoil anything if you haven't seen it yet :) Suffice to say that while these would have been icing on the cake, the cake was still very good indeed :)

In short, well worth the watch.