This is one of the best crime dramas I've seen so far, the characters steadily grows and gets more likable each episode, except for the last few episodes where the main girl character got annoying, however her annoying-ness actually make sense in the story line and made the drama better. There were one or two plot holes I found however the plot hole made the ending to the drama better than the direction I thought it was going.

The music matched a drama very well, it created anticipation throughout the story and didn't overshadow the entire scene.

I think they couldn't cast better actors/actress to make the drama better.

I would totally re-watch the drama and would definitely recommend it to other people, but only to people who enjoy dramas with thriller and very little romance.