After transmigrating to another world with only ten days left to live, Lu Yuan relies on the Heaven-Stealing Pearl, which can steal lifespans and martial cultivation, to prolong his life and survive. Living in Liu Family Village, he fights to the death to protect his adopted younger sister, Er Ya, and the villagers from local bullies and county authorities colluding with demons, killing demons and corrupt officials one after another. After rescuing Er Ya, whose soul has scattered and who is gravely wounded, Lu Yuan joins the Demon Suppression Bureau. He repeatedly solves demonic disasters and defeats stronger enemies, rapidly increasing his strength. He discovers that demonic disasters in several regions were secretly orchestrated by Wang Miao, a scion of an influential family, uncovering a vast conspiracy. After accumulating ten thousand years of lifespan, Lu Yuan unlocks the Heaven-Stealing Pearl's true power, reaches a higher level of cultivation, and protects those closest to him.