Married to the Male Lead's Brother - Chapter 13:

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

“Obtaining the topmost degree of talent in sword arts in the world requires giving up 72 years of lifespan, which leaves you with only five more years of your life. At the same time, you will never be able to feel love, kinship, and friendship, and you’ll end up leading a lonely life until your death, unable to procreate, or to have any descendants.

“From now onwards, everything related to happiness in the human world shall no longer be of your concern. Are you willing to accept this?”

“Hahahaha, I’m already alone bereft of all support, my hopes dashed to pieces, shouldering only absolutely irreconcilable grudge and hatred, why would I disagree? Why would I not want it? I couldn’t ask for anything better!!”

His sword sweeps across the Divine Continent for seven days and nights, moving 90,000 miles through the starry skies, unhindered.

He slays saints and buddhas in Heaven, slaughters demons and devils in Hell, sweeping away all the grievances in his heart.

Bai Feng transmigrated into the game and became a formidable giant of the demon race, Bai Qingling.In the game, Bai Qingling was a scheming and cold-hearted character who would do anything for immortality. He practiced the art of Voodoo, created human puppets, and committed all sorts of evil deeds.What's even more despicable was that he always treated his three adopted stunning female disciples as pawns, making them the common antagonistic bosses in the “pure love” and “fallen evil” paths of the game!Bai Feng's arrival happened to coincide with the game's finale. At this moment, Bai Qingling was severely injured, completely depleted of mana, and about to be betrayed by those around him!In order to protect himself, Bai Feng had no choice but to intensify his wickedness and interact with those around him with the most ruthless and evil demeanor.But little did he expect that...Eldest Disciple: What a great immortal Master is! I really want to cry!Second Disciple: People misunderstand him so much. Master is truly a great immortal of love!Third Disciple: If we can contribute to Master's quest for immortality by sacrificing everything, what are we waiting for?Righteous Fairy: Master, if you don't abandon me, I will be willing to abandon the light and embrace the darkness, serving you faithfully!

Akira, was born in the slum and wishes to get out but the only way he could was to risk his life in these ruins as a hunter.