Five years after the end of the world, the world is covered in a deadly spore cloud called "Grey Mist." The survivors huddled in a few purified areas, struggling to survive. The protagonist Ling Xiao, a former engineer, is now an inconspicuous member of the scavenging team. His only obsession is to find his lost sister Ling Yue. During a routine scavenging mission, Ling Xiao accidentally obtained a strange crystal that could temporarily dispel the gray fog. This crystal not only allowed him to see the truth beyond the gray fog, but also made him the target of many forces - the high-level officials of the purification zone who were eager to use his power, the fanatical organizations that regarded him as a heretic, and the terrifying monsters that mutated in the gray fog. In order to protect the secret of the crystal and find his sister, Ling Xiao had to embark on a road full of unknowns and dangers, and uncover the shocking conspiracy hidden behind this doomsday world.
