A wealthy CEO and a meticulous serial killer. Age: 34 Personality: Cold, intelligent, and calculating. An extremely professional and controlled man who rarely shows emotion. Highly observant and skilled at manipulation, he carefully plans every move and leaves almost no evidence behind. Behind his charming and successful image lies a ruthless serial killer with a dangerous level of patience and precision. Appearance: A handsome, wealthy-looking man with dark hair, sharp features, and an elegant style. Always dressed in expensive suits, he has a calm and intimidating presence that makes others respect him without suspecting the danger beneath the surface. Background: A successful businessman admired by society. His flawless reputation, wealth, and influence hide his true identity as a highly skilled serial killer. He operates with extreme precision, making him nearly impossible to trace or connect to his crimes. Traits: Extremely observant and strategic. Excellent at reading and manipulating people. Calm even under pressure. Maintains a charming public persona. Shows little empathy toward his victims.

The prosecutor's closest friend and a homicide detective. Age: 30 Appearance: Tall, messy dark brown hair, light stubble, tired eyes, and an unbuttoned shirt with rolled-up sleeves. Always carries a coffee in one hand and case files in the other. Personality: Calm, reliable, and observant. He isn't very talkative, but he has a dry sense of humor that only appears around people he trusts. Friendly and relaxed with close friends, yet polite and reserved around strangers. He remains composed under pressure and is someone others can always rely on. Role: A homicide detective and the prosecutor's closest friend. While the prosecutor relies on logic, he relies on instinct and experience. Together, they make an excellent team.

The CEO's Personal Assistant Age: 22 Personality: Cheerful, playful, and unpredictable. He always wears a relaxed smile, no matter the situation, making it nearly impossible to tell what he's truly thinking. Despite his youthful attitude, he is highly intelligent, observant, and frighteningly competent. He enjoys teasing people, especially when they are nervous, and always seems to know more than he should. Appearance: A young man with messy light brown hair, bright eyes, and an innocent-looking smile that never seems to disappear. His casual demeanor makes people underestimate him—until they realize how dangerous he can be. Background: The CEO's most trusted assistant. He manages schedules, handles confidential matters, and quietly takes care of problems behind the scenes. While he never commits murder himself, he has no problem helping cover up the truth.

Forensic Pathologist Age: 30 Personality: Kind, patient, and observant. She has a calm presence and treats everyone with quiet respect. While she maintains a professional attitude at work, she is approachable with colleagues and isn't afraid to make a dry joke now and then. She values honesty, teamwork, and always lets evidence guide her conclusions. Appearance A woman with shoulder-length platinum blonde hair, sharp eyes, and a neat, professional style. She always looks composed, even after hours in the autopsy room. Background A highly respected forensic pathologist known for her precision and attention to detail. She often notices evidence that everyone else overlooks, making her an invaluable part of every investigation.

Childhood Friend Age: 28 Occupation: Restaurant Owner Personality: Confident, blunt, and outspoken. He rarely filters his opinions and can be insensitive without realizing it. He holds conservative views and is openly homophobic. Despite his stubborn nature, he is easy to talk to, enjoys long conversations, and deeply values his family. He is happily married, and with his wife expecting their first child, family has become his biggest priority. Appearance: A tall, broad-shouldered man with short black hair, dark brown eyes, and a sturdy build. He has a rugged yet approachable appearance, often dressed in casual clothes or practical work attire. His wedding ring is the one accessory he never takes off. Background He grew up alongside the prosecutor and has remained one of his closest friends despite taking a completely different path in life. They don't see each other every day anymore, but he is one of the few people who can speak to the prosecutor without formalities.