On Qing Mao Mountain, where clan elders scheme behind closed doors and the weak are ground into dust, a fifteen-year-old boy opens eyes that have already witnessed five centuries of bloodshed. Fang Yuan has died once, cornered by the righteous factions who feared what he might become, and the Spring Autumn Cicada Gu — refined through unimaginable sacrifice — has dragged his soul back to the beginning. The world of Gu cultivation hasn't changed: Gu Masters refine venomous insects into weapons of terrifying power, and mercy is simply another word for a fatal opening.

But the man inside that youthful body is no longer the naive disciple the clan once knew. A "great demon" who walked the blood path to its utmost extreme, Fang Yuan crawls back from oblivion with exactly one desire — eternal life — and exactly zero intentions of letting sentiment slow him down. He manipulates inheritance sites before rivals discover them, dismantles family feuds from the shadows, and betrays alliances the moment they outlive their usefulness. No vengeance, no redemption arc, no softening heart. When the demonic path and the righteous path both brand him enemy, the question isn't whether he'll survive. It's whether anyone else will.

Also known as: 蛊真人, Gu Zhen Ren, Gu Daoist Master, Master of Gu, Daoist Gu.