They probable spent a lot to take this drama, but not that good. The story is good BUT progression of the story could have made it more mysterious and thrilling. Looked kinda pretentious of coling up with the hierachy system like the drama Pyramid Game but does not even level up to it even close. They tried to cut short the ending or something, that it felt all happening at once. I felt like they could have switched the actors of Kang han and the powerful guy from joosin.