Very good TV series, I've got the impression that it was inspired from SAW saga which I liked very much.
The reflection of the real life of South Korean people and the dark side of living in a big city is so realistic.
The script is good and most of the episodes have got suspense. The end of the series leaves an infinity of possible scenarios, as there is a lot of things left unveiled, any many questions remained not answered.
I expect a second season more exciting, and I imagine that 2nd season events would be about the beginning of the games, and how it did start.
I look forward watching the new season.