I started to watch this cause i had finished iris and city hunter and searching for a new action drama like them. Then i found this and say "i can try this. I don't have anything to lose". So i watched and say " this show is definitly one of my favourites" I didn't lose anything but gain a lot of things. Story: it was great. It never make me stop watching or bored. When i thought story is over, It always make me shocked by its turn overs. It has everything spies,revenge and cold-blooded,handsome man:D Cast: Lee Jun Ki ( This was the first drama that i saw him) , Nam Sang Mi, Jung Kyong Ho ultimate trio:) the atmosphere between them is so good that you can't stop watching. Especially Lee Jun ki's acting make you bewildered,it likes in one drama he has many characters. Music: It has a range from rap to classics and none of them unnecessary for drama. Rewatch value: definitely i will watch tihs over and over again.It is certain that i will find many other things while rewatching:) If you like action and revenge you must watch this drama. You will never regret:)