K2 is a revenge drama and I mean everyone is out for revenge...everyone. It has action, romance and secrets that would make you think it is awesome, but there is something missing. I'm not really sure what that something is, but I think part of the problem was the boring politics and the constant switching of sides. Plus, I don't know if all the extra characters were necessary. The upside is the characters are written with flaws and darkness. You are just waiting to see who is going to literally blow up the other first. LOL The best thing is the ending as everyone seems to get what they deserve. Ji Chang Wook is good at playing action roles and doesn't fail as Kim Je Ha. He has a way of pulling you in to a character regardless of the story line. I was fully invested in his happiness. I like Yoona, but I didn't feel for Anna like I thought I would. I'm not sure if that was her acting or the writing. I was more worried for her through Je Ha's character. Song Yoon Ah as Choi Yoo Jin stole the show. I seriously didn't know if I loved her, pitied her or just hated her. She and Jo Sung Ha as Jang Se Joon are just excellent veteran actors. The music is fine. I won't rewatch this. If you like revenge dramas, then this one is for you.