A lot of people seem to really dislike this show but honestly to me this was a gem. people are saying this could've been better and not tragic but what's the point of the show then?
Everything has flaws!

If you're into thriller, crime and intense genres then go for it. The romance is about 10% but I enjoyed it.
As you can see it's tagged with tragedy, so if you dislike that then the choice is yours, watch it or not. Oh and you will get a bit confused with all the names they'll be using.

Acting was on point, Ki Yong slayed his role. He's literally perfect. I don't see where Nana was lacking, she did amazing. Even guest roles were good. Especially the young actors.

For the music to be honest they could've done better, it's not that it didn't fit with the show it's that I personally did not like it very much.

Overall I love it. I would rewatch it again. We need more dramas like this. Very unique.