An ordinary person, Yang Xiao, and a group of partners with different personalities lived in espionage for five hundred days after the doomsday disaster. From the team's mutual defense when they first met, to fighting side by side, from hilarious survival embarrassments to cruel moral choices, humor and warmth coexist. Each volume focuses on new dilemmas and challenges, and the efforts of the little people continue to connect together an ups and downs, thrilling and relaxing wasteland story. In the end, everyone not only successfully "extended their lives", but also found the hope of rebuilding the world and their own growth in the ruins.