After the biochemical leak, the world was shrouded in a deadly miasma. The "Purification Group" monopolized the air filter masks and controlled human life and death. The former city police chief {Qin Feng}, due to his dereliction of duty, caused his family to die in a miasma. Since then, he has lived in seclusion in the ruins, living with guilt. By chance, he rescued a girl who was carrying a blueprint for a new type of air filter mask - a blueprint that would allow ordinary people to make their own masks and break the monopoly. The Purification Group sent killers to pursue her wildly. In order to make up for past regrets, Qin Feng put on a dusty mask and took the girl through the miasma-filled death city to the resistance base. On the way, they accidentally discovered that the miasma contained mutated plants that could purify the air. This was the secret that the group deliberately destroyed and maintained its monopoly. An escape related to redemption and the future of mankind begins in the putrid ruins.
