In 2056, human ambition and greed led to the Third World War. The earth was destroyed by nuclear weapons and biological and chemical weapons, and became a wasteland no longer suitable for human habitation. The sky is always shrouded in gray haze, and the air is filled with suffocating radiation dust. There are only tens of millions of surviving humans left. After countless struggles and efforts, some humans built a very large building - the City of Hope for decades. This building became the last refuge of mankind and the last spark of civilization. However, outside the walls of Hope City, another world is quietly taking shape. Another part of the human race was affected by the dual effects of radiation and biological and chemical weapons, and gradually mutated and became mutants outside the city. They wander among the ruins, constantly threatening the safety of survivors in the city. The people of Hope City have to adapt to this new reality and fight for survival. In this crisis-ridden era, a series of mysteries also begin to emerge. The top brass of Hope City seem to have some ulterior secrets. Why did this city become the last hope? Who is behind all this? Hope, like a burning bonfire, flickers in the darkness. In an unknown world, the unraveling of the mystery may determine everyone's fate.