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A disaster called "red haze" suddenly struck. Sulfide smoke caused by global volcanic eruptions obscured the sky. Surface plants died in large numbers. Oxygen levels continued to decline. Survivors needed to rely on oxygen filtering devices to survive. The civilized order collapsed within three months, and the city was reduced to ruins occupied by mutated plants and predators. The human survivors were scattered into small settlements, struggling with a lack of resources and a crisis of survival.

Carrying a mysterious sword bone, Ye Chen was abandoned at Qingcheng Mountain's "Broken Sword Cliff" since he was a child and was adopted by a reclusive old naughty swordsmith. He has a cold personality but is hot on the inside. He has always had doubts about "what is chivalry", but he has gradually become a sword master who protects the common people in troubled times.