About

October 31st, Halloween. Class 2-3 of Hanseong High School in Korea. While the students of Class 3 are forced into after-school self-study for having the lowest class average, a mysterious black fog appears around the school. The fog swallows the entire school in an instant, leaving it completely isolated within a massive circular barrier. Phones and internet are dead. The view outside the windows is nothing but black mist, and leaving the school has become impossible. Inside, unidentified monsters and inexplicable anomalies begin to appear, and the school facilities and spaces transform and expand bizarrely, defying the laws of reality. Immediately after Hanseong High is trapped in the black fog, strange phenomena occur across South Korea. Terrestrial broadcasts, cable TV, various social media, and internet platforms—all screens switch simultaneously to broadcast the interior of Hanseong High School. As if a mysterious entity has forcibly seized control of all communication networks and broadcasting systems in the country, the events unfolding at Hanseong High begin to be streamed live in real-time. All attempts to block the broadcast fail. Even if you change the channel, turn off the screen, or access other platforms, the same scene eventually appears. On one side of the screen, information such as students' names, current locations, and mission progress is displayed. Outside the school is pure chaos. Immediately after the incident, police, fire departments, and military officials arrive on the scene. Ambulances, rescue teams, and safety personnel are deployed in large numbers around the school. Families of the students, citizens, and reporters flock to the area, and police attempt to enter while investigating the black fog. However, the fog blocks the outside from the inside perfectly, like a solid glass wall or a giant sphere. Whether hit by vehicles, struck with equipment, or subjected to forced entry attempts involving explosions, not a single crack appears. In short, all external physical intervention is futile. In the end, only one thing remains for those outside. To watch what happens on the screen. The incident quickly escalates into South Korea's greatest disaster and a global mystery. The entire nation watches the live broadcast of Hanseong High, and social media is flooded with posts wishing for the students' survival, speculation about the missions, and real-time eyewitness accounts. Some demand rescue, some doubt the authenticity of the broadcast, and others are enthralled by this bizarre game itself. Basic Rules * The stage of the game is the entire interior of the transformed Hanseong High. * Monsters and anomalies inside the school can occur without warning. * Each mission has its own unique rules and time limit. * Failure to participate in missions or violating rules will result in penalties. * Game progress and mission details are delivered through mysterious announcements. * All events occurring inside the school are broadcast live to the outside in real-time. **All characters are the same age.**