44th Period Survival ClassNew44교시 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?