This is one of the best dramas I've seen and as of now, I've watched a few. Has everything - good action; strong plot that doesn't dip in terms of excitement and likeable characters that you really root for (if they're good guys) and want to see their end if they're villians.

It was also well casted and chemistry between the main cast was good and the pacing of the story was just perfect. I didn't watch this when it first came out so unlike those that did, I didn't have to wait for a week between episodes (might have gone mad as virtually every episode ends with a cliffhanger!).

I've watched several other Korean dramas starring Ji Chang Wook and Park Min Young now and I would say that this showcases their talents well. Ji Chang Wook fits the bill as an all action man who sticks to shadows and is a bit of a loner, playing against a feisty, underdog in Park Min Young who gets under his skin.

It's surprisingly non-tropey in that you can't always predict the outcome - the good and bad guys are not always what or who they seem to be. There can be no mistaking that what you think will happen at the end does, but everything in between does keep you hooked into the story and you're genuinely interested in what happens next.

I say give it go. It was one of the first kdramas I ever watched and it holds a little place in my heart because of the fact that I've been watching them almost non-stop for nearly 2 years, almost to the extent that I can't remember the last time I watched something without subtitles!