First off, great cast and very good acting. I'm a big Woo Do Hwan fan, but all the leads wete excellent, as were supporting cast.
I found the first few episodes quite disturbing and not an easy watch. I really hate bullies and those that treat physical disabilities as though that makes a person less or stupid.
S.Korea is so often portrayed as a country where those with power, position and/or money, can get away with just about anything. This drama is no different in that respect.
The friendships that are tested and the struggles to "do the right thing" are well portrayed... blood is often thicker than water, as they say.
The story got a bit far fetched at times, but the tension and feelings of threat were well written, directed and acted.
It would need a long time before I'd watch this again, mainly because of now knowing what happens.
I kind of enjoyed it, but watching was also unpleasant at times. Means it's a well made programme though.