The world situation is becoming more and more chaotic, wars are happening everywhere. The wars continue, leading to a nuclear war spreading throughout the world. The world has now become a pile of ruins. Radioactive substances and toxic substances from laboratories have leaked into the outside environment, exposing living animals and even humans. The survivors had to struggle every day to fight off the zombies stalking them, and they had to search for food and water to survive. At the same time, they must find a way to contact the United Nations to be able to reach the Green Zone, an area where the air is truly fresh enough to