I could give this drama four out of five stars, but I'm giving it five. There are a couple of things that this drama may have been missing, however, overall, I really enjoyed this drama. For a drama with no romance, yet filled with so much ongoing action & suspense, it was amazing. This drama mostly felt like a long & never ending movie, but it was worth it. The amount of content given from this drama entertained me so much, that I already miss the suspense from Hidden Identity. For Kim Bum to not have been acting in a drama for two years, this was definitely a thrilling comeback. At first it was different seeing him with facial hair, but he played Cha Gun Woo so well that the time that I needed to adjust to Kim Bum's appearance was so little to nothing.