I Became a Level -99 Vicious Lord - Chapter 160:

Su Ran, a music prodigy, woke up transmigrated into a book.

At that point in time, the main story arc in the book had already been completed. As a villainess female supporting character, not only did she need to take over the original owner’s pitiful life in poverty, she also gained an instant son right at his rebellious period.

Ten or so more years from then, the son would turn into a twisted, evil villain. He would appear in one of the extra chapters to pick on the male and female lead’s children.

***

Su Ran: Son, you shouldn’t be too outstanding.
Su Han: Why not?
Su Ran: ’cause you will be killed.

Su Ran: Son, would you like to learn music from me and become a zen, little fairy boy who only needs to drink dew.
Su Han: No, I want to go into business so I can support you.

- Description from Novelupdates

Kyle was just an ordinary gamer until a truck-kun decided he was isekai material.Waking up in the world of Path of Transcendence—a novel he once read—he realizes he’s not the hero, the villain, or even a side character.He’s an extra, someone who was never mentioned in the story. But this world is no fairy tale: it’s cursed, doomed to fall to demons, with every major character destined to die.However, Kyle isn’t as ordinary as he seems. Blessed by the Roaming Storm, a mysterious and powerful force, he wields the rare ability to command lightning, wind, ice, and water.But is he truly just an extra, or is there more to his role in this doomed world? Armed with his knowledge of the novel and his newfound powers, Kyle must find a way to survive in a story that wasn’t written for him.Can he become the missing piece that changes the fate of this world, or will he be crushed under the weight of a plot that doesn’t even know he exists?

Transmigrating to the disciples of the Demon Sect, and relying on the skill modifier to become a giant of the Demon Dao.

[Detected the technique “Blood Nerve”, relying on devouring blood to practice]

[Side effects: easily affected by the spirit contained in the blood, becoming bloodthirsty, bloodthirsty, mad, and even brain dead]

[Please wait a moment, the system is being modified…]

[Ding! The modification is complete, and the side effects are cancelled]

- Description from novelbuddy