I'll Teach You, Marianne. - Chapter 719 - Civil War

Lorelai is an unwanted princess; a puppet in the hands of the royal family.Born weak and raised loyal only to her kingdom, she has no real power and is constantly abused by both her stepmother and her son.Her value lies in one thing only––marriage. Thus, she is to marry Duke Kalder, an old but powerful and influential man whose previous wives have all gone missing under mysterious circumstances.That is until she meets him.Tall, dark, strong, mysterious, irresistible, seductive.The King of Lycans. The King of Beasts. The Gypsy King.One who was once a slave now controls the biggest and strongest, most feared kingdom of the continent. And for some reason, he has his eyes set only on Lorelai.Important note: this is a historical fantasy novel and in its context, the word “Gypsy” is only used as a name of a nomad tribe and is not used as a slur.

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

Waking up, I discovered that I had become a cat with superpowers...