Story wise- it has all of the characteristic of a good drama for me i really like the thrill and action specially the romance between the main characters in spite of the hardships and struggles they had.. Cast- i made it 10 co'z I think they are all perfect in there respective role I never imagine any actors/actresses can replace them. nana- like her being tough but really caring women. yoon sung- he has this smooth moves whenever he has task to do.He's really handsome and only love one woman. Music- just right for every scene specially and really love the ost. I even downloaded it. :) Rewatch value- i think it's not rewatchable coz you already know the mystery there. Over all - it is very good for me because it has a new taste of a drama i've never watch before knowing the fact that i'm not a bif fan of action movie/drama etc. --Hope you'll watch it and share the good reviews after.. :) happy watching... fighting!..