The Sky City Yunque collapsed, and the former chief engineer Gu Hanshan fell into the wasteland on charges. In order to pursue the truth of the "Nirvana Project", the spark of civilization, he embarked on the northbound journey, reunited with Lin Wan, his former partner who betrayed him, and started a life-or-death battle with the real conspirator Su Cheng. On the ruins of trust and betrayal, he must protect mankind's last hope and complete the transformation from a survivor to a guardian.
