MTL - All My Disciples Are Kings - Chapter 672 loser exits

A teenager named Evan Mason was reincarnated into the magical world of Harry Potter and goes to school at Hogwarts!
With only his knowledge of the future and great talent for magic, he takes the path towards the top of the magic world, only to realize that ever step he took, changed everything!

- Description from Novelupdates

“Is Fate the excuse of the forsaken, is Free Will the delusion of the chosen?”Such was a question that Xavier, the Demon King, never had the chance to ask himself. As he lay defeated, awaiting his death, he wondered about the wretched life he lived.'The hero who killed me, the one who held the same ambitions as me. We both wanted good for the people, for the world. We are both two sides of the same coin, yet, fate decided that he will be the one the light will shine on.Perhaps it was me too, perhaps it was my karma for flowing the rivers of blood with my sword. But still... It was fate that squashed the humanity in me first!Damn fate, if I had one more chance, I would've lived for myself more, I wouldn't have taken this arbitrary role of being a necessary evil... This world, this game of destiny... It can burn to ashes for all I care.'As he sunk into the cold embrace of death, a certain [REDACTED] heard his dying wish with amusement and cast their die, reversing the wheel of time one last time and going all in on him on a risky gamble with the stakes of their world.

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

Leon a young man with the heart of a killer, did something unspeakable before getting transmigrated to another world.And what's more? He found out that due to a wish of his, he got transmigrated to the body of an incubus!And he got into the body at the worst possible time!Something happened, he managed to escape death and became the last of his race...he gained the Vice and Valor System,Lewd and immoral act could give Vice point while battle and bravery can give him Valor Point...This world has magic and beauties that none in his previous life can compare.Join the exciting journey of our MC as he gains immense strength and conquers the most gorgeous girls!