I'm going to keep this review short. If there was even one issue with this show, I would list it, but I honestly can't find a single flaw. The casting was perfect and the acting was superb, some of the best I've ever seen. (Not to mention basically everybody in this show was attractive) The action scenes were great, and the plot was ingenious. This is one of my all time favorite K-dramas because it was just so flawless. I dare you to watch this show, and if you can point out even one substantive flaw, I'll take down this review. It was just that good! (Btw Ji Chang Wook is some serious eye candy <3)