I'll try to keep it short: This drama is a good psychological thriller, the perfect example of a roller coaster ride show with all it's twists and turns, ethical conflicts and not to forget all the characters and names to remember xD. It's further dark and intense, might not be everyone's cup of tea.

It was messy in some parts and also tiring in others, because so much was going on with so many characters involved. What also bothered me was the editing in some episodes, they jumped from one scene to another with no transition like really scene 1 *cut* scene 2 *cut*, but other times it was so smooth that I was puzzled if they occasionally let an intern practice editing. Also, the middle part was a bit dragging BUT the first few episodes were mind-blowing and the last ones (the special ones as well) and especially the ending were so well-rounded, that I'm really glad I chose to watch this show.

The cast is great - fitting and really talented, everyone did a great job portraying their given characters, wouldn't be surprised if they get an award for "best ensemble of the year" or something similar. Special mention must be made of Lee Seung Gi and Lee Hee Joon - they understood the task and delivered. It's not easy to make the viewers feel the character's emotions be it fury or pain or joy, but it was a breeze for these two, found myself crying every time they did.

The background score was apt - well-timed and elevating the scenes.

All in all a good, captivating show which makes you ponder on ethics and morals.