On the eve of the doomsday, courier Fang Jianhong accidentally activated his ancestral brass express box and discovered that its capacity and functions could increase as the level of express delivery tasks was completed. After the global catastrophe, in the wasteland world where order collapsed, he relied on the "infinite warehouse" golden finger to grow from a scavenger to a "doomsday postman" connecting the strongholds of survivors. In the cracks of the zombie wave, mutant beasts, and ambitious forces, he used express delivery missions to connect the scattered glimmers of humanity, and finally revealed the dual secrets of the source of the disaster and the origin of the express box. The highlight is the strong binding between "express delivery mission" and "apocalyptic survival" - each mission is not only a material supply line, but also a key clue to promote the plot. The classic writing style depicts the tenacity and warmth of ordinary people in desperate situations.