MTL - From White Box To Supervision - Chapter 81 Junko Yanagida

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

Abandoned by Fate, but Chosen by Chaos.A world where magic reigns supreme and the mightiest wizards stand at the apex.A world where one’s mana affinity, if one even had it, determines one’s status in society, whether one could soar through the skies like a dragon or remain grounded, scraping by like rats or chickens.This was the world Hal Fennec was born into.Raised in the poverty of a border village, Hal had one wish: to give his mother a better life, one free from the constant fear of beast attacks and invasions by the Fellkin.But fate seemed to be playing a cruel joke.Despite being the brightest and most confident among his peers since childhood, Hal turned out to be barely qualified to become a wizard.His natural talent, contrary to his expectations, was nowhere near enough to fulfill even his modest dream of a decent city life.But then, just when his final hope was snuffed out and the future seemed gray and bleak, a twist of fate—or more fittingly Chaos—granted him a system that would turn everything around.

There is a very strange restaurant in the City of Sin.

Collapsed without warning, and upon awakening, he found himself back in his childhood.He thought it was a blessing from above, but unexpectedly, tumultuous changes ensued, shrouded in mystery...