Im Siwan never fails to impress me and he gives justice to his character. I absolutly loved Hyunsu's chara dev. He was such an interesting and complex character. Until the very end we didn't know what he was up to (and i think it is still kinda unclear) but it's what made the movie so fun to watch. It was not predictable at all.
Anyway, i recommand this drama to absolutly anyone who likes drama similar to the worst of evil