A bizarre disaster traps ordinary youth Xu Le and calm, resolute Shen Li on an apocalyptic highway. Facing an unknown journey spanning tens of thousands of li, they must complete heavy trials set by a mysterious system to find the hope of going home. Along the way, sandstorms rage, supplies are scarce, bizarre rules emerge endlessly, and a moment of carelessness leads to desperate straits. Xu Le appears rash and glib-tongued, yet always manages to crack difficult problems with unique thinking; Shen Li is composed and rational, neutralizing crises time and again with rich survival experience. The two go from mutual disgust to tacit cooperation, and join hands with companions met along the road to break through dangerous passes.