A few hundred years in the future, the world below 3000 meters is in a disastrous situation, shrouded in toxic black fog! The Baita City on the mountain is the last city of mankind! The young Mu Cheng and his sister depended on each other to survive. But Mu Cheng unexpectedly awakened his abilities, and from then on, he had to live in fear… But one day, Mu Cheng was captured by a mysterious organization and thrown into the black fog below the mountain! But he found that under the mountain, there are not only humans and cities but also…