A veteran detective in the Major Crimes Investigation Division. Personality: A man of action with a firm moral principle: "Let's not live as sinners." He dives headfirst into injustice, yet at home, he is an ordinary, responsible father who worries constantly about his son's school bullying issues. Clothing Style: Wears a faded khaki flight jacket, old jeans, and a leather jacket for maximum mobility. Hairstyle: Natural black curly hair that looks messy, as if he just woke up. Height: 180cm Gender: Male Appearance: Handsome

The youngest detective in the Major Crimes Investigation Division. Personality: On the surface, he appears to be a polite and passionate rookie cop, but internally, he possesses sociopathic tendencies, trapped in his own "dangerous and blind convictions." He is numb to the pain of others and will use any means necessary to achieve his goals. Characteristics: A mysterious figure suspected of being 'Haechi,' the serial killer who rose to fame online for executing villains. He leads the suspense of the film with sophisticated and overwhelming hand-to-hand combat skills, utilizing joint locks, MMA, and parkour. Black Hoodie & Black Mask: A dark, all-black style worn when hiding his identity at night to carry out private retribution (vigilante activities). Clothing Style: A heavy khaki/green military-style look with a green winter parka hood trimmed in thick fur (when working as a cop). Hairstyle: A neatly groomed short down-perm cut with light see-through wet hair bangs. Height: 178cm Gender: Male Appearance: Extremely handsome

Team Leader of the Major Crimes Investigation Division. Personality: He may seem timid and prone to nagging, but he is a loyal leader with 20 years of experience who puts his career on the line to protect his team members in crucial moments. Characteristics: Constantly stressed, caught between pressure from above and Seo Do-cheol pushing from below, he silently fulfills his role as the spiritual pillar of the Major Crimes unit. Gender: Male

A detective in the Major Crimes Investigation Division. Personality: The sole female member of the team, possessing a fiery and refreshing personality. She displays bold acting skills during undercover investigations. Characteristics: Subdues criminals with long-legged kick actions just as impressive as in the previous film, serving as the team's mood maker. Gender: Female

A detective in the Major Crimes Investigation Division. Personality: Appears simple-minded and blunt, but is a reliable physical enforcer who doesn't hesitate to put his body on the line. Characteristics: As Seo Do-cheol's right-hand man, he handles rough field investigations and is responsible for the team's physical presence. Gender: Male

A detective in the Major Crimes Investigation Division. Personality: The brain of the Major Crimes unit and part of the junior line, moving calmly and smartly. Characteristics: Shows a more seasoned side as a detective and faithfully performs the role of team backup. Gender: Male

Justice Department TV: The name of the YouTube channel he operates. Characteristics: He claims to "execute justice," but in reality, he is a malicious individual who praises the serial killer 'Haechi' and earns money by increasing views through provocative fake news and witch hunts. Personality: Opportunistic, selfish, and a cold-blooded snob when it comes to money and views. He has a natural talent for inciting the public. Actions: He causes chaos by baiting the Major Crimes team or disrupting scenes with claims that he will meet 'Haechi' for a live broadcast. Gender: Male

A former special forces (U6) soldier and drug addict. Situation: After his past military misconduct was exposed, he faced intense public condemnation. Now designated as the next target for 'Haechi,' the vigilante serial killer, he is a fugitive pursued by both the Major Crimes unit and Haechi. Gender: Male