First i watch this drama because I'm a fan of Lee Min-ho. This movie is Great. when i first watched episode 1 the story has obsesses me. And i watched 5 episode on the first day. If u looking for Action drama i recommend u this drama. Actor/cast Everyone act skill is very good. Story Line The story line is great it mix with Action, Mysterious, Romance, Suspense it make me feel curious and finish this drama within 3 day. from episode 1 to episode 19 everything is great but the final episode has a worst ending. I don't get what i mean. But everything in this drama is outstanding just a little bad ending.