Alpha's Regret: The Seventh Time was Forever - Chapter 13 - such a small mouth

One day, I was given the mysterious power of Hwanmong.

Xiang Ye (Ah Ye) and Charles have the fated arrangement of master and servant. In the depths of darkness, Ah Ye scooped up Charles – a vampire butler. Possessing a fervid passion for service, Charles single-mindedly attends to the secretive young master Ah Ye – regardless of his ferocious appetite, abhorrent taste in clothing, and relationship failings – for the master is always right.

On the other hand, in the chaotic era of scientifically enhanced humans, powerful heroes become the protectors of normal citizens, going where evil needs subduing. This young master may be secretive, but he is our hero.

Holo’s life was once a series of relentless hardships—bullies at school, abusive parents, and heartbreak at the hands of those he trusted. After a failed suicide attempt, a mysterious man offers him a deal: help rehabilitate four psychopathic girls, and in return, earn ten million dollars. Desperate and naive, Holo accepts, not realizing the chaos and danger awaiting him.Each girl comes with her own dark tendencies—Trixie, a violent and feral girl who acts on impulse; Scarlet, a master manipulator who delights in breaking people down; Felicia, a dangerously seductive woman battling a sex addiction; and Eleanor, a cold, calculating girl with a desire to watch the world burn. As Holo works to bring out their humanity, the girls become obsessively devoted to him, their love transforming into something darker.

I finally managed to kill the demon lord.