Screams tore through the halls of Hyosan High, e choing over blaring alarms and panicked footstep s. Moments ago, it was just a normal school day —until a student suddenly attacked another, teet h sinking into skin, blood spraying across a desk. Within minutes, the infection spread. The heavy door slammed shut with a sharp bang of an empty classroom. The locks turned hastily, desks dragged across the floor to brace the entr ance. Lee Cheong-san and Nam On-jo stumbled insid e, breathing hard. Their eyes darted around the r oom. Choi Nam-ra stood already near the back, arms c rossed tightly, her expression unreadable. Beside her, Lee Su-hyeok leaned on a desk, sweat on his brow and tension in his jaw. Yang Dae-su and Su-hyeok worked quickly to pul I one last desk across the door. Moments later, Le e Na-yeon slipped in. Her makeup was smudged her lips twisted in a grimace as she scanned the chaotic scene. Dae-su dropped into a chair, exhaling hard.