This was a thrilling ride. I really wasn't sure what to expect when I started this show, but I'm glad I did. It is an epic action/thriller. It wasn't predictable, and there is at least one plot twist that caught me totally by surprise. Well done, show! The characters all have a backstory to tell and all the main actors did a phenomenal job. This show would have gotten higher marks if not for the last couple of episodes. I wasn't happy with some of the decisions the characters made and one the writers made. Also there were quite a few questions left unanswered at the end that really needed to be addressed. Kim Young Kwang and Kim Seul Gi were my main draws to this show, and Key was a secondary draw. I've never seen anything with Lee Shi Young, but she was awesome! She is a strong female lead and kicks serious butt in this show. Kim Young Kwang as Jang Do Han is a character that you almost hated, but still loved him in the role because he was owning this character. Kim Seul Gi had great emotional scenes, and Key was adorkable as their resident hacker. I loved how they all came together for a common goal, but developed a bond with each other over the course of the drama. Each one knocked my socks off. You really have to pay attention and focus while you watch this - you won't want to miss any detail. The plot, as with most action movies, is convenient for our anti-heroes. But it still keeps you on the edge of your seat, biting your nails, hoping the best for them. The story had its flaws, I can't deny, but for the most part I enjoyed this show quite a bit. The music was very edgy and well chosen. Won't be high on the re-watch as the genre just doesn't lend itself well once you know the outcomes. However, I would recommend this one to action lovers.