Nuclear winter has arrived, civilization has collapsed, and humanity is no longer the master of the world. Species mutations and scarce resources create an unpredictable future and environment, leading to a series of crises. To protect themselves, humanity has built walls, but outside these walls, survival depends on blood and fire. The protagonist, Ren Xiaosu, and his younger brother, Yan Liuyuan, are among them. They were just ordinary teenagers in the wilderness, without shelter or a way out; their only support was each other. But fate granted them the power to awaken in their dire circumstances. The Jingshan earthquake caused the collapse of Wall 113, fully shattering the post-apocalyptic chaos. During their escape, Ren Xiaosu and his family rescued Luo Lan, the military leader, and entered Wall 109. A new life was about to begin, but the real test had only just begun… (Source: Bilibili, translated)