Executioner

In a world plagued by superpowered criminals, former top-tier hero Seo Gangyu abandons his heroic morals following his brother's brutal murder. Assuming a false identity as a prison corrections officer, he infiltrates maximum-security Ruculus Prison to exact merciless retribution. When a catastrophic breakout plunges the world into global war, Gangyu is legally deputized as the ultimate executioner to hunt down escaped monsters.

Formerly a celebrated moral-bound hero shattered by his brother's murder. He casts aside his heroic identity to infiltrate Ruculus Prison as a corrections officer, driven by insatiable vengeance. He employs a destructive crimson aura that can obliterate armor and shred physical matter.

The dimensional terrorist and leader of Alpha World who seeks to eradicate ordinary humanity and build a world for superpowered beings alone. He orchestrates the catastrophic Ruculus Prison breakout that triggers the global war.

An eccentric legendary fighter who masters pure internal physical energy, unlocking raw bodily power that surpasses supernatural abilities. He takes Gangyu under his wing and refines his combat capabilities beyond the crimson aura.

A tactical operative who recognizes Gangyu's unique combat value and uses him as her primary weapon against Alpha World threats. Her strategic intelligence complements Gangyu's raw destructive capability.