If you see no other action drama in your life YOU HAVE TO SEE THIS ONE! I started watching this drama as it was airing last year and I can honestly say despite not knowing anyone in the cast it had my interest as soon as I saw the trailer. The cast is FANTASTIC! Every actor played their part amazingly. There wasn't a single episode (except maybe the first one) where I wasn't on the edge of my seat to find out what happens next. Jung Kyung Ho is solidified as one of my favorite drama actors of all time! I can't say too much because even a little gives a lot away. I will say however that there is an alternate ending to the show (which I personally liked better than the aired one!!) so be sure to check that out.