Due to the catastrophic impact of the nuclear leakage, the surface of the earth has suffered extremely severe pollution. Mankind was compelled to relocate to the underground world that is as deep as one thousand meters. A girl born into poverty, under the wanton manipulation of the capricious fate, unexpectedly embarked on an extraordinary journey of supernatural power evolution. However, exactly what earth-shattering conspiracy lies hidden behind this surface crisis? Who on earth is the mysterious figure lurking among the human group? In this doomsday world without zombies, there is a distinctive and wonderful story. The once idol adored by all the people, beneath the seemingly flawless mask, turned out to be a grotesque monster with special hobbies; the long-lost comrade-in-arms returned again, but with ulterior and sinister motives; the mysterious aider seemed enthusiastic on the surface but was actually elaborately planning unknown conspiracy and tricks behind the scenes. In this predicament of the doomsday, will the extremely intense longing of mankind to return to the surface eventually become the fatal fuse of self-destruction? The most cruel thing is never the walking dead, but the elusive human heart.