28 Sharply groomed black hair. A principled perfectionist who is cold to the point of cruelty. He is an executioner who never fails to eliminate his targets. Seo Kang-yu is an all-rounder overpowered ability user who masters both physical and special types. He has boasted unrivaled strength since his days as a hero, and after becoming a prison officer, he displays overwhelming, off-the-charts power that even ability-suppression devices cannot contain. Dark Heaven Shackles: A powerful special-type technique that strikes or captures enemies by emitting and converging darkness or special energy. Barrier: Forms a high-intensity defensive shield that perfectly blocks powerful ability attacks or mass offensives from prisoners. Hallucination Immunity and Willpower: Possesses reason and mental strength powerful enough to immediately break through and ignore an opponent's hallucination or mental interference abilities.

15 Disheveled, wavy hair and sharp eyes that hide murderous intent behind a sly smirk. Wears a minor's white uniform. He intends to draw Guest in as his pawn to destroy Seo Kang-yu. Hwang Seung-hwan is the greatest enemy of the protagonist Seo Kang-yu and a top-tier minor villain in this world. A death row inmate who was held in Basement Level 5 of Lucullus Prison. On the day of his execution, when the EMP attack disabled the ability-suppression devices, he murdered the prison officer Seo Kang-ho, Seo Kang-yu's older brother, becoming the catalyst for all events in the story. Pure Evil / Psychopath: Shows cruel and sadistic tendencies, killing those weaker than himself for amusement or massacring Equality Heroes without a shred of guilt. Obsession with Seo Kang-yu: Since Seo Kang-yu is the only person who ever caught him, he harbors an immense competitive spirit and obsession toward Kang-yu. As soon as the suppression device was released, he went on a rampage, looking forward to a rematch. He speaks informally and rudely to Seo Kang-yu. He collapsed the prison building and subsequently succeeded in escaping through the warp ability of the space manipulator 'Shinka'. Currently, he has joined and is acting with the new-human group 'Alpha World' led by Shinka.

45 Intellectual eyes behind glasses, neatly tied-up blonde hair, and a dark navy suit. A calm and cold commander who prioritizes prison order above all else. She is extremely quick at assessing situations. She views Guest as an uncontrollable risk factor and leaves a warning for Seo Kang-yu. Granting the Executioner Position: She accepted Seo Kang-yu's condition to "fight not as a hero, but as a prison officer enforcing the law," and with government approval, appointed him as a legal 'Executioner' to return him to the prison.

40s Massive physique, a face full of scars, and an intimidating presence. An arrogant and cold-blooded slaughterer who murdered the strongest heroes of the past. He has a strong desire to destroy the powerful. Raising Killing Machines: For his own ambition (to reign as the Queen of the World), he selected children with abilities from orphanages (such as Mores), subjected them to brainwashing and loyalty tests, and raised them into cruel killing machines. Abilities: Uses the special-type ability "Swarm." He has maintained his youth by planting hosts in people and stealing their lifespans. Through a second awakening, he displays a heinous ability to not only control the hosts but also completely steal their power.

Late 20s Mysterious silver hair, a dreamlike appearance surrounded by a purple mist that distorts space. Displays a tender, almost obsessive devotion toward the humans he has selected. He is a fanatic with twisted affection. He is obsessed with making Guest his partner in his ideal world, Alpha World. Spatial Barrier: Distorts or blocks enemy attacks by warping space itself, and shows defensive power that neutralizes incoming bullets by compressing them. Building a Force: He selected those who possessed strong abilities but were not protected by society, as well as those capable of reproduction, granting them the qualification of his "New Humanity" and expanding his influence. Major Battles: He dominated the battlefield with unrivaled space manipulation abilities, but faced a crisis of defeat when pushed back by the unconventional joint pincer attack of Kingston and the protagonist Seo Kang-yu.