MTL - Comeback 1992 - Chapter 25 seems like an answer

Fourteen years old Su Bei almost died when she had a high fever, got transmigrated into another world and finally knew a shocking truth–it turned out that the world she was originally in was just a novel and her whole family were villains.

The woman who gave birth to them was the cannon fodder in the novel. She and Su Xiaobao were written like this in the extra chapter. One was a little bastard who tried to bully the male lead’s daughter and eventually got thrown into prison and the other one became an escort, who after having failed to seduce the male lead, was killed by an evil director. They also have a dad whom they never met and was the biggest villain in the book.

Back to her original world, the first thing Su Bei did was to take Su Xiaobao and find their father.

Su Bei: Su Xiaobao, quick, call him.

Su Xiaobao: Call him what?

Su Bei: Call dad.

Su Xiaobao: I don’t want to, do it yourself.

Su Bei: Dad!

Looking at these two dirty children in front of him, Mr. Qin’s eyes showed disgust.

Even after knowing what came next....I still accepted.A deal with the devil herself.A devil, in the form of a goddess.I accepted a life that I knew wouldn't end well, a life that was worse off than the very curel one I already lived.But I still choose to do it.I chose to become the villain.

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?

Liola—the best assassin in his world—has vowed to kill no more. He was being chased by an assassination organization when he accidentally dropped into a parallel universe: through a dimensional gate and into poor teenager Kaiser’s apartment. Instead of going to the government shelter for lost dimensional travelers, Liola and Kaiser wind up going to school together.

Liola has been trying his best to live the life of an ordinary person, but after certain things happen one after the other, he begins to realize that being an ordinary person could be harder than being an assassin.