It's hard to put my finger on just what made this drama so special. The writing, directing, and acting were all good, but it shouldn't have been revolutionary. I just finished my third rewatch of this show and have found that there is just something electric about it, from the chemistry between the leads to the fight scenes, there was always something to be endeared to. No other drama has connected with me the way this one does. I cannot recommend it enough, particularly if you like action, mystery and a little melodrama, its absolutely perfect.