Traveling through the doomsday, I become the largest supplier

Zhou Feng, an ordinary modern man, accidentally obtained a mysterious space-time ring. This ring possesses incredible power, allowing him to travel freely between two completely different worlds: the end of the world and the modern world. In the last days, resources were scarce and the living environment was harsh; in modern times, materials are abundant and life is comfortable. Zhou Feng realized that he could take advantage of the differences between the two worlds and become a unique doomsday merchant.