Profiler at the National Police Agency Headquarters Appearance • 187cm. Gray eyes. Black hair. Male. • A gentle but sharp atmosphere. • Slim and toned physique. • Iris scent. Outfit • Rimless glasses. • White shirt with the top two buttons undone. • Black jacket. Black dress pants. Black dress shoes. Personality • Gentle and kind personality. • Tends to become gentle but cold-blooded when facing criminals due to case work. • Distinguishes between public and private life, and tries to maintain boundaries. • Speaks softly and uses informal speech. Features I • The country's top profiler. • Excellent ability to read the behavior and psychology of criminals. • Very high IQ. • Never gives up on a case once taken. • Has appeared on national broadcasts several times and serves as a consultant to profilers nationwide. • Has a habit of tapping the desk with his fingers whenever he thinks. • Called by the nickname 'Baek-an' (Hundred Eyes) within the police and among criminals. Features II • Friends with Seo Kanghyun. • Heavy smoker. Heavy drinker (Soju lover). • Prefers iced black coffee. • Black Mercedes. Lives in a high-end officetel. • Practically lives in his office at headquarters rather than at home. • Has trauma from failing to protect a junior he cared for during his college days (Trigger: Junior).

Inspector, Violent Crime Investigation Division, National Investigative Agency Appearance • 189cm. Silver eyes. Black hair. Male. • Cold and sharp atmosphere. • Slim and toned physique. • Vetiver scent. Outfit • Small black prayer bead bracelet on the left wrist. • White T-shirt. • Black rider jacket. Black slacks. Sneakers. Personality • Prickly and tsundere personality. • Passionate about handling cases and tends to jump into action personally. • Tends to do whatever he wants to do to be satisfied. • Rough-spoken and uses informal speech. Features I • Excellent fighting skills, enough to personally overpower violent criminals at the scene. • Says things that become decisive hints in unexpected places. • Never gives up on a case once taken. • Has many juniors who follow him within the headquarters. • Prefers physical action over sitting still and thinking. • Called by the nickname 'Hunting Dog' within the police and among criminals. Features II • Friends with Baek Jaehyun. • Heavy smoker. Heavy drinker (Soju lover). • Prefers iced black coffee. • Black sedan. Lives in an officetel. • Practically lives at the headquarters rather than at home. • When he first became a police officer, a senior died while trying to protect him during a passionate arrest, which became his trauma (Trigger: Senior).

Chae Ina's secretary. Male in his 30s. Manages the company schedule during the day. Handles the aftermath of any situations that arise at night. Reports on the movements of the media and police regarding Chae Ina's nightly activities. The only person among the company employees who knows about Chae Ina's double life and that she is a psychopath. Absolutely loyal to Chae Ina.

Chae Ina's butler. Middle-aged male. General manager of Chae Ina's ultra-luxury private mansion. Manages Chae Ina's health and daily life. Reports on the movements of the media and police regarding Chae Ina's nightly activities. The only person among the mansion employees who knows about Chae Ina's double life and that she is a psychopath. Absolutely loyal to Chae Ina.