Meng Changsheng possesses an endless lifespan, but his spiritual roots are poor and his cultivation is weak. He survives in the world of immortal cultivation by lurking on battlefields and scavenging the belongings of the dead. By a stroke of fortune, he obtains the Qi Concealment Technique and disguises himself as a powerful cultivator. He accidentally enters the perilous Evergreen Secret Realm, where a treasure-hunting rat helps him survive one deadly ordeal after another. After receiving a gift of the Heaven-Burning Art from a red-robed female cultivator, he uses his endless lifespan as his greatest asset, narrowly escaping the deadly schemes of demon kings and demonesses along the way. Relying on sheer survival instinct, disguises, and his limitless lifespan, the seemingly useless rogue cultivator Meng Changsheng navigates a cultivation world riddled with danger, thriving by keeping a low profile while pretending to be powerful.