In the year 2026, a suffocating, unprecedented heatwave of 42°C strikes South Korea, turning Hanseong High School into a claustrophobic death trap. Deep beneath the surface, the extreme global warming thaws ancient permafrost, awakening a dormant 25-million-year-old virus. Behind closed doors, the school's eccentric science teacher, Mr. Lee, secretly experiments on the pathogen until a mutated lab mouse bites a student named So-jin. Instead of seeking help, Mr. Lee kidnaps her, injecting her wit