My Players Are So Fierce - Chapter 4:

Joseph Knox, one of the most prolific and well-known serial killers on the planet.A person considered so demented and manic that even trying to reason with him was believed to be a waste of time. A man so far gone that he seemingly didn't deserve any pity even on his deathbed.So why? Why would a man like him receive a second chance? And why did the world around him seem so familiar?Disclaimer: AU when it comes to some parts of Madara's plan(I'll try to make it make sense at least), and aliens don't exist in this world

With an F-rank Trait, deemed the worst of the worst, 5-year old Shin Yu-sung is abandoned by the Shin-oh family, which is famous for raising hunters.The same year, he meets one of the strongest hunters, the Fist King, at the orphanage and is adopted by him.The Fist King became the strongest not through his Trait or special abilities — but by training his body.He takes note of Shin Yu-sung’s physique instead of his Trait—Nine blocked yin pathways.“Your blocked pathways cause your body’s mana to overflow, giving you an exceptional mind and god-like looks! But you also pass away before coming of age…”An abundance of bodily yang.“Your body is overflowing with the energy that can cure your nine blocked yin pathways!”

A polite and lethargic boy was reincarnated in another world as a vampire bishoujo.