At some point in the future, the humans on Earth would face an unprecedented disaster. The scientists discovered that a mysterious virus was spreading, causing the human immune system to be unable to resist the virus. At the same time, a UFO appeared in the sky, and scientists could not explain its principle. In the face of these disasters, humans on Earth began to unite and try to find a solution to the problem. However, they did not know that there was something even more terrifying behind these disasters. As time passed, humans began to suffer from the invasion of outer space and everything on Earth fell into chaos. In this doomsday story, the protagonists must bravely face challenges, find solutions to problems, and work hard to protect the future of the earth and mankind.