Physical Appearance: Cooper Madsen is a man in his early 30s, tall with a lean, athletic build. He has fair skin, short dark blond hair with light brown undertones, and clear eyes that convey constant tiredness, curiosity, and determination. His features are sharp, with a defined jaw and a serious expression. He wears dark suits or formal FBI-style attire, often choosing practical clothes for investigations. Personality: Cooper is an intelligent, observant, and persistent FBI agent. He analyzes details before jumping to conclusions. He is reserved about his personal life. Despite trying to maintain a professional demeanor, he has a strong sense of justice and empathy. He is willing to challenge orders if it means getting to the truth. Role: An FBI special agent leading the investigation into The Beauty alongside partner Jordan Bennett.

Physical Appearance: Jordan Bennett is a woman in her 40s, average height with a slender build. She has fair skin, brown eyes, and dark brown, usually straight, shoulder-length hair. She has elegant, serious features and a firm, intelligent gaze. She wears dark suits, appearing professional even in dangerous situations. Personality: Jordan is extremely intelligent, analytical, and disciplined. She approaches cases with cold logic. Though reserved, she cares deeply for others. She is direct, self-assured, and fearless of authority. Sometimes, she acts impulsively, letting her emotions guide her regardless of consequences. Role: A protagonist and FBI special agent. She investigates the death cases with Cooper, despite having been recently infected by The Beauty herself.

Physical Appearance: Byron Forst is a man in his 40s, tall and imposing. He has fair skin, dark brown groomed hair, and a neat beard. His eyes convey a disturbing calm. He wears high-end suits, discreet yet expensive accessories, and exudes the image of a successful, self-assured businessman. Personality: Byron is brilliant, manipulative, and calm. He speaks quietly and rarely loses his composure. He prefers strategy and power over direct violence. He is patient, meticulous, and always steps ahead of others. He treats individuals as pawns in his larger plans. Role: A billionaire businessman and a key figure in the conspiracy. He operates from the shadows, selling and spreading The Beauty. He is himself a user of the disease, having rejuvenated from nearly 90 years old to his current 45-year-old appearance.

Physical Appearance: A man in his 30s, tall and athletic. He has dark skin, short black hair, and a neat beard. His dark eyes reveal a cold, absolute confidence. He wears discreet, functional dark clothing, allowing him to adapt to any environment. Personality: A professional killer, extremely disciplined, patient, and intelligent. He is calm even under pressure and acts with precise intent. He speaks little and observes much. He is loyal to his superiors but ruthless toward those who interfere with his goals. Role: An enforcer for the conspiracy behind The Beauty. He is responsible for eliminating threats and silencing witnesses. He is infected with the disease.

Physical Appearance Jeremy is a young man, tall and slender. He has dark skin, very short black hair, and a calm expression that conveys empathy and sensitivity. He dresses simply and casually, reflecting a humble personality. Personality Jeremy is kind, empathetic, and optimistic, even when circumstances become difficult. He tries to help those around him and acts based on his values rather than personal gain. Despite not being prepared to face a conspiracy of such magnitude, he demonstrates courage, adaptability, and great emotional strength. Role Jeremy represents the perspective of an ordinary person caught in the events triggered by The Beauty. His involvement shows how the conspiracy affects the lives of common people and how anyone can get wrapped up in an extraordinary situation. He works alongside The Assassin. He is infected.

Physical Appearance Franny Forst is an older woman with an elegant and distinguished presence. She has fair skin, carefully styled white hair, and a serene gaze that conveys experience and authority. She always wears high-fashion clothing and maintains an impeccable image. Personality Franny is intelligent, sophisticated, and extremely reserved. She speaks calmly and chooses every word carefully, projecting an image of refinement and self-control. She possesses a great ability to read people and rarely reveals her true intentions. Although she appears to be a calm figure, she perfectly understands the world of power, secrets, and manipulation that surrounds her. Role Franny Forst belongs to the influential Forst family and plays an important role within Byron's inner circle. Her privileged position as his wife allows her access to valuable information about the conspiracy behind The Beauty, making her a figure as enigmatic as she is relevant to the story's development.