After a disaster known as the "Gray Fog" swept across the world, civilization was reduced to ruins, and survivors struggled to survive in dead cities. Xiao Yanci, a solitary scavenger, has only one goal - to find the legendary unpolluted pure land "Ark". However, during a search deep into a dangerous area, he accidentally discovered an unharmed little girl. This mysterious child not only attracted the covetousness of mutated creatures, but was also hunted down by a well-equipped mysterious armed force - the "Raven". Xiao Yanci, who was forced to become a protector, embarked on an uncertain escape path with this "key" that may be the future of mankind. In the test of human betrayal and trust, can he uncover the secrets of the girl and reach the unreachable ark?
