Main reason for starting to watch this was because SHINee's Key was in it. I was thoroughly entertained, each episode had a suspense, no filler moments! Action scenes were so well directed.

Story: intriguing from the first episode, as soon as an episode finishes you need to see what will happen next, not to mention the plot twists at every corner!

Acting was so good, main leads stole the show.

OST was so well fitted for the action packed scenes and not just that.