Please
Blade witnessed his parents being murdered by unknown men when he was a child; the death of his parents became a trauma that caused him not to feel anything even if he witnessed the death of a baby; blinded by the death of his parents, his heart was locked away from love, friend, relative, or care.
He is known in his high school as the dude who will forever be on demon times with his cold and unfazed life that even scared his teachers out of their wits at the sight of his cold gaze that seemed to be watching their feeble souls.
After a few years of school, Blade became the world's most feared assassin, the unrivaled ruler of the underworld; his name was feared, and he was known as the legendary "Death blade," the one who is only nourished by the blood he shed.
All of this came to an end one day when his assistant "Cyber demon" snitched on him.