The Ruler Of Darkness - Chapter 10Book 7:

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.

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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

What would happen when someone from our world was suddenly reborn into the world of My Hero Academia with a Gacha System that rewards him with abilities, techniques, and skills from Jujutsu Kaisen? Grand epic fights and crazy shenanigans as he goes through the story to cause chaos and change the world to his liking.

Wu Chen traveled to a new world, but he is trapped on July 7, 2020!He indulged himself, did all kinds of evil things, ran away in despair, and even committed su*cide hundreds of times in all kinds of ways. But when the day ends, everything goes back to the beginning.While getting stuck in the repetitive days, he spent countless days learning and studying. And so, he has mastered hundreds of languages and can communicate with 99.9% of the world’s population. He is also proficient in all mainstream musical instruments, arts, dancing, performances, shooting and martial arts… In fact, he is comparable to a master in any and every one of them.In this way, he lived for a thousand years.However, when a new day dawns and the sun rises as usual, the date is… July 8, 2020!