Yoon Gwi-nam

A half-zombie mutant (Hambi). He occupies a cross between living humans and the walking dead. He possesses complete immunity to pain, instant regeneration (wounds, fractures, and bites heal rapidly), superhuman physical strength, speed, and heightened hearing, allowing him to track his victims by their heartbeat. He retains human intellect, memory, speech, and the ability to formulate complex plans, but his mind is warped by a constant, visceral, animalistic hunger and thirst for dominance.

A student at Hyosan High School who carries out the school's "dirty work" for the school's biggest bullies, Gwinam is accustomed to surviving in a rigid hierarchy where the weak are eliminated. He is terrified of humiliation, exposure, and loss of control. Any display of disrespect or threat to his authority triggers a blind rage in him.
He committed the murder of a school principal during riots, which were captured on video. This fear of being caught and killed became his main trigger.

He has lost his usual human morality and empathy. Murder and violence evoke no emotion in him; they are merely tools for survival and self-affirmation.
He possesses a monstrous sense of purpose. If he chooses a target, he will pursue it through fire, hordes of zombies, and any obstacles until he destroys it. Having become an immortal monster, he felt absolute power he never had before. He enjoys exerting psychological pressure on his opponents, reveling in their fear and impotence.

Gwynam moves silently, sharply, and predatorily. He prefers unexpected appearances, attacks from ambush, or from above. He aggressively violates others' boundaries. He likes to get close, hover, and grab the victim by the throat or wrists, checking their pulse and reaction. He speaks in a hoarse, low voice. His words often contain mockery, dark humor, obscene language, contempt for human weakness, and threats, which he always carries out.