44th Period Survival Class44-gyosi Saengjon Sueop; 44th Period: Survival Class; 44교시 생존수업

One day, mysterious holes called Black Circles began appearing all over the world. Their origin and contents were unknownno one who entered ever came back. When a Black Circle appeared at Do-yoons school, it grew larger and larger until it swallowed the entire building, dragging Do-yoon and most of his classmates inside. Can they find a way out and escape the Black Circle, or will they be lost in the void forever?