I just finished this drama today and even though it took two months, I never got bored once. The only reason it took that long was partly because I was really busy and also partly because I did not want it to end.

It's a really engaging drama from the get go with a very gripping and realistic storyline. I'm surprised this was Park Hae-soo's (Kim Jae-hyeok) first lead role as he did amazingly well. In fact every actor in this drama was superb. Lol I miss it already.

SPOILER AHEAD;
My only issue with the drama is the disappearance of Hanyang, Kaist & Ko Park-sa, they were some of my favourite characters but I guess the fact that they disappeared makes the reality of the prison system more realistic.