In the year 2147, sea levels rise by forty meters, and humanity falls back to survive on the lowest level of the giant floating city Ark. Long Xiaochen, a lower-level pipe maintenance worker, encounters a seabed accident, gets infected with the zombie virus but does not mutate, awakens poison control abilities, and can also see dead people's danmu from past reincarnations. Relying on danmu early warnings to expose conspiracies, he teams up with Su Qing, a rational half-zombie military doctor, and Manman, a little boy capable of warning. They confront Ark ruler Zhou Batian and Abyss Cult leader Yin Wuji, exposing the crazy plan of extracting corpse crystal fuel from living people and summoning the ancient corpse king. After experiencing multiple reincarnations, Long Xiaochen ultimately chooses to self-sacrifice to seal the abyss rift, ushering in a brand-new reincarnation start.