MTL - Shoujo Grand Summoning - ~ 1999 ended... let everything turn into memories...

A phoenix is a creature of legends, a wonder of the world, an imagery of life and destruction. This fabled creature signifies the rise of a hero in a virtual world where battles occur for the sake of honor and glory!

One day, fate played a cruel joke on Fujino. When he woke up, he found himself in the world of Detective Conan. Now, he’s a high school detective with no parents, a four-story building to his name, and a barely sustainable career solving cases.Just when he was at a loss for what to do, a Professional System suddenly activated, allowing him to acquire real detective skills—through pay-to-win mechanics.From that moment on, he ditched the usual “Conan logic” and became a true rational detective, using real investigative techniques instead of convenient anime tropes.Q: Why do you, as a detective, know so many different skills?Fujino: Well, isn’t it normal for a professional detective to actually learn professional skills?

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