I Went to Seek Refuge with My Fiancée but Entered the Wrong Door, and a Witch Stole Me Away

[A kept man who turns the tables + invincible power fantasy + a wife-chasing crematorium] Chu Feng transmigrates to a fantasy world and becomes a doomed cannon-fodder fiancé in a book. In the original story, after his family falls into decline, he travels to Qingyun Sect to seek help from his fiancée, Ye Qingcheng. But the heroine breaks off their engagement. Humiliated, he picks fights with the male and female leads at every turn, only to be killed by the male lead as a warning to others. To stay alive, Chu Feng wants no part in the main plot. He plans to break off the engagement himself, sever all ties, and keep his head down. But on the way up the mountain, he loses his way and accidentally stumbles into Netherworld Hall, right next to Qingyun Sect. He's captured as a spy and brought before Yan Wushuang, the hall master. This bewitchingly beautiful demoness is cold, imperious, and kills without batting an eye. When she learns who Chu Feng is, a playful smile curls her lips. “Ye Qingcheng of Qingyun Sect's fiancé?” What a coincidence. Just then, Chu Feng's kept-man System awakens. [Beginner reward: Supreme Yang Sacred Physique] The world's most potent furnace physique, brimming with pure yang energy. Yan Wushuang takes a liking to Chu Feng at first sight and makes him her cultivation partner. She promises him wealth and status if he agrees, and death if he refuses. Chu Feng makes up his mind on the spot: he'll gladly live off her! Others become kept men to cling to powerful patrons. Chu Feng does it to defy heaven and become a god. Yan Wushuang: “Here's a Marrow-Cleansing Pill. Take it.” [Critical reward: Immortal Marrow-Cleansing Pill.] “This is the Netherworld Palm. Take it and learn.” [Ten-thousandfold reward: Nine Nether Demon Emperor Fist] “...” From then on, his cultivation surges without pause. He defeats opponents above his level, sweeps aside every prodigy, and conquers the world...