When a science teacher’s experiment goes horribly wrong, a zombie virus breaks out at Hyosan High School, trapping students inside a desperate fight for survival. The series follows a group of teenagers, including the resourceful Nam On-jo and her childhood friend Lee Cheong-san, who must navigate the chaos of their infected classmates while facing the brutal realities of a world turned upside down. As the infection spreads rapidly, the students grapple with moral dilemmas, forming fragile alliances and confronting their deepest fears in the claustrophobic hallways and classrooms. The central conflict pits their will to live against the relentless horde outside, while also exploring themes of friendship, sacrifice, and the societal pressures that drove them to this point. With a tense, high-stakes atmosphere blending horror and emotional drama, All of Us Are Dead delivers a gripping survival story that keeps viewers on edge. The talented ensemble cast, including Park Ji-hu, Yoon Chan-young, and Cho Yi-hyun, brings depth to these young characters facing an unimaginable crisis.