The End of the World: Build a Top-Notch Secret Service with the Delta at Your Back

The apocalypse has come to the world, and the climate has suddenly changed drastically. In some areas, heavy snowfall has never ended, and the temperature has plummeted. What's even more frightening is that meteorites bring unknown viruses from deep space, which spread and mutate at an alarming rate. The infected quickly lose their minds and become walking zombies who only know how to eat! The plague spread like wildfire, quickly infecting most living things on the planet. However, in the wasteland world, there is an extreme shortage of food and medicine, and the greed and ugliness of human nature exposed in desperate situations, When the survivors struggle for a piece of bread in the ruins, when the former goddess is willing to fall for a piece of chocolate... The number of survivors is still mercilessly decreasing. Zhao Chen is one of the countless survivors struggling on the verge of death. However, just when Zhao Chen was about to starve to death due to lack of food, he suddenly awakened [Delta Material Exchange System! This was a gold-digging game he had played before, but unexpectedly it became his hope for survival today! In the wasteland world, choose the world maps [Lo City], [King Hai], [Tokyo], [Philadelphia]... Choose your operator skills, search, attack and evacuate in this apocalyptic world, exchange Huff coins, advanced materials, advanced weapons, purchase survival supplies, build various top defense facilities, and create a top secret service office! ! !