The apocalypse is coming, walking corpses are rampant, and a greasy backpack found in an abandoned newsstand reveals a shocking conspiracy! The vague dates on the yellowed medical record, the scalpel wrapped in gauze, the strange yellow fluid seeping out, and the mysterious writing "They are afraid of light but not sunlight" all point to the eerie abandoned hospital. Three short and two long signals from the emergency team, the invisible wave of corpses, the mystery of the disappearance of the little girl's father, plus the bite scar on Zhao Gang's arm that is homologous to the yellow liquid, all the doubts are piled up! Who is guiding the walking dead? What secrets are hidden in the pre-apocalyptic hospital? Why is Zhao Gang's wound different? Every step of exploration is thrilling, every reversal subverts cognition, and the truth is far more terrifying than the doomsday itself!