First of all, I did not expect this drama to turn out the way it did. I guess I expected more philosophical, light musings on human nature and less gore? But it still turned out pretty well.

THINGS I DIDN'T LIKE:
I think what bothered me the most through every episode was this feeling that something was lacking. I can pinpoint it down to the cinematography and the camera angles at times, as well as this feeling that the producers didn't want us to take this drama too seriously.

For example, the scene where the camera revolves 360 degrees around Jong Woo and Mun Jo looked like bad CGI and just took out the enjoyment of it. This kind of revolving happened 2 or 3 times and was off putting. The scenes with the pervert confronting Jong Woo or vice versa were kinda disappointing after the first time.

The story itself felt outrageous at times, as if the writers had deliberately aimed at shattering any suspension of disbelief the viewers might entertain. I mean, the building owner Bok Soon has a history of odd deaths all around her and nobody found it suspicious except the lone local policewoman? A detective goes missing and nobody blinks an eye? People (like the reporter) get killed or kidnapped in broad daylight or in busy places and no witnesses? There are other buildings around Eden Studio, and no still no one sees anything? What about that church lady? What happened to her? What about that other lady who made predictions? Did she die? I was also surprised when Jong Woo didn't notice the other twin go missing (also dead). It really bothered me when no one asked after the other twin.

I wanted Mun Jo to have some real background, and the lone twin as well. All characters except Im Si Wan's felt one dimensional, perhaps because there's only ten episodes.

THINGS I LIKED:
The ACTING OH WOW! Im Si Wan has outdone himself, and Lee Dong Wook as well. I utterly fell in love with Im Si Wan's facial expressions and his inner struggle that one could see in his eyes. I loved the creepy smiles he threw in episodes and the times he would break down and look like a baby about to cry. I thoroughly enjoyed Lee Dong Wook's expressions, the curve of his lips, the death and mirth in his eyes. The creepy pervert guy and the sniggering twin were also portrayed extremely well.

The psychological and philosophical angle of the story was very good. The drama shows us various kinds of 'good' and 'bad' and how these often blend or tend to make little hierarchies in our minds. For example, the bullying that Jong Woo's girlfriend and Jong Woo himself faced at the office was done in these civilized, professional environments but caused a lot of emotional damage to the victims. How is it any better than physically hurting or killing people? Can emotional trauma be taken less seriously than physical trauma? Especially if the former leads to the latter? I liked how the drama showed that nobody took Jong Woo's distress seriously, and he never truly sought professional help for what went down in his army days. All the little things added up like dominos and led to the eventual end that the drama came to. I also liked the hints towards Kafka's Metamorphosis: a person dedicates his whole life working and working and working, and yet is treated like trash in the end. Jong Woo and his girlfriend are prime examples of modern Korean (in face the modern world's) condition. You work your way to death, and you remain poor, unhappy, unappreciated and unloved, yet you're supposed to smile and bow and say 'thank you'. Gregor Samsa laid down and died when nobody wanted him around, but Jong Woo retaliated and fought back. Is Jong Woo really the bad guy?

For me, these deeper messages of the drama trump the complaints I had with it, and so the 8.5 rating.