They became engrossed in conversation for so long that Cheng wound up at a large mansion that night, where the lady, named Miss Ren, lived.
Cheng professed his love for her and proclaimed that he would take care of her and find her a place to live if she would marry him.
Stunned by her beauty, Wei Yin tried to make a move on Miss Ren and intended to rape her.
Miss Ren would try to help both men by bribing families to get new women for Wei and to make more money for Cheng.
Because of Ren's frequent advice, Cheng was able to secure a nice position in work and get a good deal on a blemished imperial horse.
However, although Miss Ren had proven to be insightful and powerful, Cheng was hesitant to take her word on matters whereas Wei Yin never questioned her methods.
Cheng was greatly upset that Miss Ren had been killed thanks to his foolishness, and so he spent his own money to give her a proper burial and erected a grave marker to her.
When he returned home, Wei Yin asked to see Miss Ren only to be informed by Cheng that she had been killed by hunting hounds.
This is when Cheng revealed Miss Ren's true nature as a fox-fairy to his cousin, who in disbelief travelled to her grave to dig up her body and see for himself that she was indeed a fox.
Shen JiJi's Renshi zhuan is thought to have invented the 'fox romance' genre, and as such influenced works such as the Liaozhai Zhiyi; it was popular during the Ming Dynasty and Qing Dynasty, and was included several compilations including the Yu Chu zhi (虞初志), and Taiping Guangji (太平廣記).
Why didn't Cheng take his Miss Ren's warning about her impending doom when all he previous advise had come true and benefited him?