Villainess cultivator + male lead with no sexual history + not a strong female lead + slow burn
One day, she is reborn as the eldest daughter of the Lin family, a cultivation clan. By then, the Lin family has been slaughtered by demonic cultivators, and only Lin Shuxu has managed to escape.
To stay alive, she struggles through every hardship until she finds her fiancé, Xu Yao, the Qianqing Palace's senior disciple, hailed as the foremost cultivator of the righteous path.
The first time they meet, she nearly becomes a cauldron for a demonic cultivator. He descends through the clouds, his sword flashing like a rainbow, its light splitting the heavens. To him, Lin Shuxu is no more than an ant, and she doesn't even get the chance to identify herself.
The second time they meet, she nearly gets cut down by the righteous cultivators. He watches her plead for mercy with a pair of sword-sharp eyes, cold as frost. Even when faced with his fiancée, branded a demonic cultivator, he feels not the slightest pity.
Later, Lin Shuxu obtains a book. In it, a villain falls into the demonic path after the death of loved ones and takes revenge on the world, only to meet a wretched end. That villain is her.
She decides to play the villain to the hilt. If demonic cultivators harm her, she'll kill every one she meets. If the righteous path abandons her, she'll overturn the order between immortals and mortals, along with the laws of heaven and morality. If that bastard betrays her, she'll shatter his Dao heart and drag him from his pedestal!
Content warnings: 1. The heroine suffers in the early story, while the hero suffers later.
2. The heroine gets a golden finger from time to time.