A hundred years after the apocalyptic disaster "Red Fog" swept across the continent, mankind retreated to the "nine steel fortresses" to survive. Among them, the seventh fortress "Zhenbeiguan" in the northwest has become a corner forgotten by all forces because it is located on the edge of the Gobi with scarce resources. The protagonist Tian Jinglin is one of the "scavengers" at the bottom of the fortress. He makes a living by searching for materials from the old era in the red fog contaminated area. During a fatal in-depth exploration, he unexpectedly obtained the incomplete data chip of the "Great Wall Project" of the old era, which not only contained the key clues to purify the red mist, but also revealed the secret of the secret collusion between the fortress's high-level officials and the external mutant group "Corruption". In order to protect the only remaining companions around him and to break the shackles of the fortress hierarchy, Tian Jinglin struggled from the bottom and used the survival wisdom of a scavenger to connect oppressed civilians, low-level soldiers with righteous hearts and "remnants" who had mastered some technologies. In the fortress where yellow sand and steel intertwined, he launched a counterattack against power and doomsday.
