This is literally not only the best k drama that I have ever seen, but also the best series.
It made you think and took to to all sorts of places. I don't want to give out any spoilers, but if you haven't watched it, you haven't lived!! Brilliant acting from Lee Hee Jun and Lee Seung Gi, brilliant script and writing and of course the direction.
I would recommend that you take notes though because I had to!!!
It's dark, dangerous and atmospheric- I was really impressed by Lee Seung Gi's acting- and I am really looking forward to his next acting project after this because I did not know that he could do that!! Good move to pick such an unconventional role- it really sets him apart from his peers.