Doomsday Lord - Chapter 337:

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

A single beam of light could annihilate the world, a single blade of grass could sever the stars.Shen Qing transmigrated to a magnificent universe where immortals and mortals coexisted, becoming a lowly hunter.With the help of the Water Ink Panel, Shen Qing could endure the refinement of Qi-Blood and cultivate a hundred techniques.A technique, after a thousand hammerings, could border on art, and an art, after a hundred refinings, could border on Dao.From the common Bow Technique of rural hunting, to the Sky-Patrolling Sun Shooting Bow Technique;From the Nine Skills, which nourished and trained Qi and Blood, to the undying Six Paths of Reincarnation Technique;From the outward release of strength in Wind Defying Finger, to the Qi that suppressed mountains and rivers with the Eight Desolate Annihilation Seal;From enduring the refinement of Qi-Blood, he embarked on a difficult path of seeking Dao; to commanding the skies, with the divine might as if overseeing a prison, having mastered the balance of the six realms.It was only when Shen Qing looked back that he realized he had unwittingly become the supreme ruler above ten thousand Daos, an unparalleled True Monarch!

Struck down amid the battle, the Hero and Demon King meet their demise. As their souls linger on the edge of the afterlife, a mysterious force intervenes, merging their fragmented souls together with a new being. Rusty, the living armor, now affected by their memories and presence, embarks on his own quest. Will he seek revenge on those who betrayed the hero, or will he fulfill the desires of the fallen demon king? or instead, forge his own path?