MTL - I Try To Become An Immortal Through Mortal Science - Chapter 1271 two blue scales

Following the death of his popular online persona, seventeen-year-old Suzuki Mato decides it's time to retire from professional VR gaming. However, his plans are abruptly cut short when he's kidnapped from his high school and forced to be a guinea pig for Genaco Gaming, the world's largest esports and entertainment company. Armed with nothing but his wit and a new online persona, he's thrown headfirst into the virtual reality of “Live No Evil,” a VRMMORPG littered with overpowered bosses, secretive NPCs, and backstabbing gods. His mission? Find a way to conquer this new world and get back at the company that took over his life, all while avoiding 'Parallel' -- a condition that would make it impossible to separate his real and virtual personalities. Because in a world obsessed with VR gaming, Parallel means death, and Suzuki just doesn't have time for that...

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

This isn't just a game for me, it's a fckin war! And I will conquer it, no matter what…… I'm coming for it all!A wild journey of a boy from Japan named Haruma Kusaka, who hates Football the most… Yet is obsessed with winning everything that exists in this game, creating a legacy that no one can ever match.

Champion dream of an e-sports boy!
Champion dream of an e-sports boy!
Champion dream of an e-sports boy!

- Description from Uukanshu