Did the Villainess's Storyline Go Off the Rails After I Transmigrated Into a Book?

[Transmigrate into a book + wicked supporting heroine + restrained and patient] A wicked supporting heroine and a cool, aloof male lead defy the plot and choose each other. After Cheng Wan transmigrates into a book, she discovers she's become the wicked supporting heroine whose family sent her to a poor mountain village. According to the ending, the male lead is supposed to sell her to a crippled old bachelor? To stay alive, she wins over the neighbor, placates the male lead, brings the heroine and hero together, makes cosmetics, and builds a business. But why is the plot going more and more off track? Why can't she get the leads together no matter what? “Master Lu, there's nothing wrong with you except that you're truly too cold. I saw A Jiao crying across the way just now. Didn't you know...?” “A Jiao, if he's a little cold, then you be a little warmer. If he's cold and you're cold too, won't you both end up freezing?” She takes on her abusive, explosive-tempered husband, and he says the young lady has two sides to her; She teaches herself to brew wine and make cosmetics, and he says the young lady even knows how to do business; She can even cook now. So, can a person really become someone else? But she's afraid the plot will turn against her, and even more afraid she won't get a happy ending. She retreats as he advances, until she has nowhere left to go. His gaze burns into her. “Can you tell me what you're really thinking?” He adds, “Who can say which path is right and which is wrong? You have to walk it to find out, don't you?”