In a challenging atmosphere, this movie, follows the struggles of an advanced student, who does his best to survive, after being attacked by a supernatural power and he has to solve a group of puzzles to survive, the thing that challenges him.
more interesting is the underlying motive for these outrages upon the student body: a bloody revenge against the iniquities & inequalities not just of Korea's competitive school exams, but also more broadly of the nation's hierarchical 'class' system
