Don't trust the reviews claiming it's "fast-paced". Yes, most of the scenes are, but some of the scenes are completely useless too (I love crime/mystery movies and tv shows as well as slow paced Asian movies). But what makes a good storytelling is that every scene counts and add a value to the story. Each episode is 1 hour long, it could have been 40 minutes with a brillant film making and film direction/storyboard. Also, the drama aspect is over present in a bad fashioned style to me.
Also, Netflix translations are... pretty basic and sometimes lead to think that the characters are a bit dumb...
All in all, it's a good TV show, but with too many stylish intent and overdoing the drama bit, guess it's the usual Korean way nowadays.