A Mastermind? No, I'm just the Live-In Son-in-Law - Chapter 10: Parsha

In this world, orphans or just anyone without any hope for this world can apply to become a “walking target”. Their sole purpose is to be a practicing dummy for the students of the sect who train to become “Demon Hunters”. These students need “walking targets” to test their training on living, walking beings of flesh and blood.
In exchange, they will be provided with food & shelter.
Their existence value is lower than a slave, but if they manage to survive a few years they can receive a life long pension.

Xiao Han is such a “walking target”. One time he witnessed a powerful Demon Hunter disposing a demon. When the demon died, a fragment of the demon that managed to escape entered Xiao Han’s heart. No one saw that, and even Xiao Han himself only felt some discomfort for an instant.

But that thing in his heart soon gave Xiao Han visions, and the first one is of a cultivation method which allows Xiao Han to absorb damage to enhance his body. A perfect cultivation method for a “walking target”.

- Description from Novelupdates

In childhood, they were neighbors. Xie Zhen always bullied Li Yu.

You thought being reincarnated as an extra-side character was bad? Imagine being thrown into the body of a villain who is disowned by his own family and discarded by the author.

Confession school belle rejected? Reward the five thunders to rectify the law!

Confession of the devil’s beautiful tutor was rejected? Reward the Golden Light Curse!

Confession of the Wan Yao Queen was rejected? Reward Eight Wonders……

The confession was rejected, and was regarded by everyone as a negative example of not thinking about cultivation and indulging in personal relationships with children.

It wasn’t until he was rejected a hundred times that everyone realized that Lin Feng was invincible!

- Description from novelbuddy