I watched K2 because Ji Chang Wook played the main character. Otherwise I probably would have never picked it up. In my opinion, anything with Ji Chang Wook becomes better than it would be without him. But as for the drama as a whole? It was a mixed bag. Some things just didn't work. There were many plot inconsistencies and things revealed near the end (I just finished the last episode a few minutes ago...) that weren't explained enough or were kind of rushed. I feel like the whole story could have been fleshed out more. Also, you have to take a lot of what happens with a grain of salt. Dramaland is very strong in this drama. K2 should not have been capable of what he was capable of, especially near the end. There are too many little inconsistencies and faults that I can't remember them all. I'd have to watch the show again and write them all down. I won't do that though. You'll just have to see for yourself. By far, the first 5-6 episodes were the best out of the entire show. After that it went downhill most of the time with a few bumps here and there. I mean, it wasn't that bad, but nothing beats those first few episodes. They sucked me in immediately. The characters were okay, but like I said before with the plot inconsistencies, they apply to the characters too. Near the end I really wasn't sure what some of these characters were about. Also, the relationship between the two leads never moved my heart. It felt misplaced. The transition needed to be done better. There were a few cheesy moments here and there as well. The end was weird too. I felt like some of the reactions these people had to things were backwards and they need to get checked out by doctors. The action scenes were fantastic! Though sometimes even those didn't make sense. A lot of the times guns weren't used when they were within reach and I'm pretty sure it was just a plot device to help out K2. But other than that the fighting was just breath-taking. The music was amazing! I want to download the soundtrack as soon as possible. Overall, it wasn't a bad show. If you are watching it for the same reason I did, Ji Chang Wook, you'll be pleased. If not, you might just want to concentrate on the action and music and not question what's going on. If you don't want to do either of those two things, at least check out the soundtrack and pass on the show. The soundtrack is at least worth listening to.