At first, it felt like any other day at Hyoson High School in South Korea. Students rushed through crowded hallways, half-asleep teachers called attendance, and the usual groups filled the classrooms with laughter, gossip, and secrets. Jisoo, Yoonchae, Wonyoung, Nayeon, Junhee, Chaewon, Yunjin, Eunchae, Sakura, and Kazuha were trying to survive exams and friendships, while Jimin, Taehyung, Jungkook, Jeongin, Felix, Hyunjin, Jungwon, Heeseung, Niki, and Sunghoon dealt with rivalries, pressure, and the feeling that something in the school had been wrong for weeks.