It's not bingeable that is why it took me a while to finish it. But good heavens the scenes and characters seem so realistic (except for some sanitized dramatic effect). Although not in South Korea, I had 10 months of experience inside a prison (got out in 2014) so many scenes, characters, and dialogues are relatable to me. What a great writing!
Having said that, this is really glorifying prisons and the justice system controlled by the bourgeoisie. I had to suppress that idea while watching this series.