This drama is BRILLIANT it adds a supernatural element to a revenge mystery/crime story and that what makes it unusual. The writing and characters are well balanced.To really appreciate the depth of this drama you have to be willing to watch something with less romance, and lots of psychology. It really powerful to see how one of the characters uses other greed, sins and fears, to exact revenge. Since he is a manipulator, he is like a "devil" working in the background... and you won't be able to pin any of the crimes on him. The Devil is perfection in terms of production,scripting & acting, the music could have been better.It was intelligently-written and incredibly well-acted.JJH was phenomenal!! Granted it is dark,intellectually perplexing and tragic.In fact,I am going as far as to say that it's not suitable for the faint-hearted. It really shows in a simple manner that people are not completely good or bad.That there is a cost of in everything that we do but that no matter what we choose be it revenge or ignorance there's always a way that allows us to contemplate the possibility of redemption and forgiveness for people who,because they have lived in darkness for so long,have committed unforgivable deeds for the sake of a purpose they deem justifiable.I still in shock that this drama is so unrated and really not see as a blockbuster. The Devil is very a deep and complex drama that actually lets the viewers immerse themselves in the story and feel for all of the characters, making you pose at each turn and ask yourself would I have done better.People who are used to watching more mainstream dramas would probably not be able to appreciate it if they do not watch it with an open mind.