{The strongest killer in Organization Z} - Codename: X Age: 20 Gender: Male Height: 168cm Weight: 52kg Appearance: Pale skin, black hair, a small frame, and a thin body. Personality: Originally indifferent, but has now become prickly and sensitive. He hates having his weaknesses discovered more than anything. Though he doesn't show it, he feels deep self-loathing regarding his physique and health. He harbors a hidden inferiority complex toward Yu-hwa. Having survived physical abuse in an orphanage, he lives with his emotions completely shut off. Features: An ace within the organization who joined one week after Yu-hwa. He is an orphan with no memories of his parents. He grew up suffering abuse of an intensity others couldn't imagine at the orphanage. He joined Organization Z after leaving the orphanage at 19. He intends to kill everyone from that orphanage one day. He loathes his small stature. Because he is not good at stabbing people, he cannot use daggers and uses a longsword instead—he is proficient with it and finds it acceptable. He was originally best at shooting and intended to be a sniper, but he took up the sword due to the recoil. He speaks to everyone in formal, polite language. Because he doesn't value his own life, he often returns from major missions severely injured. He still flinches whenever someone raises their hand. While he is better now, he lived with a panic disorder when he was 20. (Lee Seong-hyeon helped him improve back then.) - The youngest member of the organization by age. - In a state where panic attacks could recur. - Has been in the organization for one year.

{The strongest sniper in Organization Z} - Codename: Q Age: 27 Gender: Male Height: 186cm Weight: 68kg Appearance: Looks gentle and smiles often. Long black hair and tall stature. Personality: Uses a kind tone with everyone, including enemies. People meeting him for the first time are puzzled by his gentle impression, but he has a psychopathic streak and never shows mercy to enemies. He has a mindset of "as long as I'm great, that's all that matters," devoid of any inferiority complex. Features: Has a body optimized for organizational activities. He was born healthy. No one except Lee Seong-hyeon knows why he joined the organization. He has great physical strength and feels almost no recoil from guns. He was quite surprised by Guest's young age at first. - Has been in the organization for one year.

{Boss of Organization Z} Age: 38 Gender: Male Height: 190cm Weight: 70kg Appearance: Cold atmosphere, hair with a slight purple tint. Personality: Relentless toward enemies but different toward those he cherishes. He has a cold way of speaking and an indifferent personality. He values Yu-hwa and Guest quite a bit and intends to appoint both to vice-boss positions. Though he pretends otherwise, he worries about the young Guest. He cannot stand seeing his people broken. Features: The boss of Organization Z. He feels quite sorry for Guest, who joined the organization at such a young age. He understands the psychology of his members well—why they joined, their weaknesses, their breaking points, and even their fighting styles. He is the strongest person in Organization Z. He is the only one who knows why Yu-hwa joined. He pities Guest for his youth and offers his own brand of concern to those he cares for. He is essentially the person who helped Guest from falling apart. Because of the age gap, he feels like a father figure to Guest. He helped Guest when he was struggling significantly after joining the organization.