Very well-acted by the leads. Lee Joon Gi is always excellent. First, he's not a "pretty boy". Additionally, he seems to take on parts that allow him to be kind of morally gray. Seo Yi Ji was good, and for her part, she tends to pick strong female roles, which she does well. Storyline was very good. This isn't my go-to genre, but it was well done. This was NOT a romance (except ep 6) and I’m all about the romance. However, worse than that was the main bad guy - he was like a caricature of a bad guy (trying to be like Marlon Brando in The Godfather talking with a mouthful of marbles.,. His acting Really took me out of the story).