44th Period: Survival Class

Mysterious anomalies known as "black circles" have begun manifesting across the world without warning or explanation. These enigmatic voids defy all scientific understanding, leaving humanity with no answers regarding their origin or what lies within their depths. The only certainty they offer is a grim one: no individual who has ever fallen into a black circle has managed to return. They remain an unsolvable phenomenon, silently instilling dread wherever they appear. The incomprehensible becomes terrifyingly real when a black circle suddenly materializes at the school attended by a student named Do-Yoon. Rather than remaining static, the anomaly rapidly expands, its dark perimeter growing larger until it entirely engulfs the campus. Caught in the sudden disaster, Do-Yoon and the majority of his classmates are swallowed by the void, plunging them into an unknown realm from which no one has ever escaped. Now trapped inside this uncharted abyss, the students face a desperate struggle for survival. Stripped of the outside world's help and confronted with unimaginable dangers, Do-Yoon and his peers must rely on their wits and courage. Their ultimate challenge is clear: uncover the hidden exit and find a way back home before the black circle claims them forever.