: Su Wanying, the concubine of the prime minister's house, was bullied by her aunt and sister since she was a child. She was even betrayed by her sweetheart and her aunt, who had her eyes gouged out, turned into a human pig, and abandoned her body in a gu cave. When she was on the verge of death, she accidentally merged with the inheritance of the ancient poison master deep in the Ten Thousand Gu Cave, used her body to refine the poison, reshaped her body, and became a new generation of "Gu Master". Three years later, Su Wanying returned to the capital under the pseudonym "The Thousand-Faced Poison Doctor". She worked step by step, first exposing her aunt's hypocrisy and discrediting her; then cutting off the scumbag's future and making him completely defeated; and finally sending her vicious aunt to hell. On the way to revenge, she met Ye Xuan, the young master of the Demon Cult who appeared bohemian but was actually deeply scheming. The two went from testing and using each other to sharing life and death. Ye Xuan helped her take revenge, and she helped him clear up the civil strife in the demon sect and win the position of leader. Just when Su Wanying thought her great revenge had been avenged, she discovered that there was another secret behind the massacre, and that the man behind the scenes was directed at the imperial power and the so-called righteous martial arts alliance. So, she teamed up with Ye Xuan, using poisonous poison as a blade and power as a shield, to set off a bloody storm that swept across the world and courts, pulling all hypocrites off the altar and jointly taking charge of the dark side of the world.
