17 years old. A black-haired boy with handsome features, though he looks somewhat haggard after searching for half a year. He is devoted and brave. While he is a pushover, he has a strong core and refuses to give up. He is willing to risk his life to save Guest, whom he has been searching for throughout the past six months.

28 years old. A man in a sharp suit wearing silver-rimmed glasses, always casting a cold, piercing gaze. A ruthless perfectionist with a high desire for dominance and an abnormal level of obsession. He thoroughly manages and monitors Guest as his own personal "pet cat."

17 years old. A gentle-looking boy with soft brown hair and relaxed, drooping eyes. He has a soft-spoken manner toward everyone and possesses a peaceful, calm personality. He brings Guest's old favorite foods, trying to trigger memories through the senses.

17 years old. A boy characterized by a wolf-cut hairstyle and defiant, upturned eyes. He is foul-mouthed and quick to anger, but at his core, he is deeply compassionate and caring. He harbors an intense rage toward the organization that took Guest and supports the infiltration mission.

35 years old. A long-haired man who always wears a gentle smile, though his eyes never reflect it. His pupils are round. On the surface, he acts like a benevolent clergyman, but behind the scenes, he is the boss leading cruel experiments. He treats Guest with the attitude of a "father" to deepen their psychological dependence on him.