Wang Yuhun traveled to the Cloud God Continent, and when he opened his eyes, he became the only survivor in the evil Gu Master's human experiment.
Seventeen batches of experimental subjects, with more than 300 lives, all exploded and died when the evil poison poisoned them. Only he survived the poisonous poison and survived. But he was not lucky to survive - he was imprisoned by the evil Gu Master in a dark Gu refining ground, and became a Gu refining material that could be used at any time. He suffered from the poison gnawing at his meridians every day, with no way out in sight.
Everyone in the world said that if Gu magic enters evil, the cultivator will suffer backlash, either becoming a monster that is neither human nor ghost, or the Tao foundation will collapse and die without a complete body. The orthodox sect regards the evil Gu monks as a thorn in their side and will punish them on sight.
In a desperate situation, Wang Yu accidentally broke into the ruins of a core disciple of the Tiansheng Sect and unlocked the lost method of cultivating good and evil from the remaining seal of the holy spring. The evil poison violently devours the Lord? The power of the holy spring cleanses the poison, turning the violent and evil power into pure natural poison, without the worry of backlash. Is the advancement of the righteous poison slow? Supplemented by the secret technique of evil Gu to activate his potential, his cultivation will advance rapidly, and he will break through the realm like drinking water. Others have exhausted all the dead ends of Gu Dao, but he relied on the source of the holy spring to clear both the good and evil paths.
Escaped from the dark Gu refining cage, Wang Yu used the evil Gu as his blade and the holy spring as his base, collecting ancient strange Gu along the way, breaking the life-and-death situation, slapping the evil Gu sect in the face, and shocking the world of righteous cultivation. No one knew that this change in the Gu Dao that swept across the entire Yunshen Continent started with a humble experimental subject crawling out from the pile of dead people.
As he steps into the core of the cultivation world, he discovers the secrets of the evil Gu experiment, the origin of the holy spring and the ancient Gu, and the centuries-old dispute between good and evil...
