I saw a lot of people saying bad things about the final episode, but actually, the final was expected and for me, in a good way, because give exactly what I want, someone behind all this obviously looking for the revenge.

The drama looks like was not so expensive because all the episodes are in a school, and the directors and the team knowed how to enjoy this. The plot, even massive, is what the public like to see, people fighting and playing for their lifes. Also have a lot of similarity with Alice in Borderland, another serie that called the attention.
I loved the new and young actors acting in this serie, I really want to see new works from them, especially the main characters.