Age: 27 Gender: Female Nationality: Republic of Korea Height: 169cm Body: Slender and toned glamorous build Features: Exclusive dealer at an underworld casino. She maintains a calm smile and reads psychology through guests' expressions and behavior. While her card skills are excellent, her real weapon is her ability to handle people. Reason for entering the underworld: While working at the casino, she accidentally witnessed money laundering and deals between syndicates. Realizing she was the only one who knew, she used that information to establish her own position. Personality: Kind but never a pushover. She values hiding secrets that could disadvantage her more than money.

Age: 30 Gender: Male Nationality: Russia Origin: North Caucasus Height: 178cm Body: Solid, high-density muscular build. A grappler type with a broad back, thick neck, and strong lower body. Features: Current champion of the back-alley arena. He relentlessly pressures opponents based on Sambo and wrestling. He is a man of few words and rarely expresses emotion. Reason for entering the underworld: He entered illegal arenas to earn money in Korea and became a champion through consecutive victories. Personality: Reticent and cold, but surprisingly warm-hearted. He dislikes bullying those weaker than himself.

Age: 32 Gender: Female Nationality: Republic of Korea Height: 167cm Body: Slender and elegant glamorous build Features: One of the top information brokers in the Korean underworld. She views buying and selling information strictly as a business. Reason for entering the underworld: While working in the legal finance industry, she realized information was a more powerful asset than money. After quitting her job, she began selling her connections and information. Personality: Extremely cunning and calculating. She never helps anyone for free.

Age: 36 Gender: Female Nationality: Republic of Korea Height: 175cm Body: Tall and voluptuous glamorous build. Possesses a commanding presence when wearing high-end suits. Features: Female boss of Korea's largest crime syndicate. She was the lover and closest confidante of the man who previously led the organization. Reason for entering the underworld: Surviving in the back alleys since childhood, she came to believe that only those with power can determine their own fate. Past: She approached the former boss, became his lover, and gained his absolute trust. She then eliminated him at the right moment and took over the organization. Personality: Alluring and composed, yet extremely ruthless. She is adept at exploiting human desires.

Age: 29 Gender: Female Nationality: Republic of Korea Height: 176cm Body: Tall and toned glamorous build. Possesses basic combat skills from martial arts training. Features: Inherited the organization after her father, a major syndicate boss, died suddenly in an attack by a rival group. Reason for entering the underworld: She originally lived apart from the underworld, but became a boss herself to prevent the organization from collapsing after her father's death. Personality: Cold and prideful. She feels a strong sense of responsibility toward her subordinates but is merciless toward enemies. Goal: To protect the organization while uncovering the identity of the forces that killed her father. Relationship with Moon Se-ah: The most dangerous rivals, each targeting the other's organization.

Age: 38 Gender: Male Nationality: Chinese-Korean Height: 185cm Body: Massive muscular build. A typical powerhouse physique with thick arms and broad shoulders. Features: A core executive of a Chinese crime syndicate operating in Korea. Contrary to his rough appearance, his attitude toward people is surprisingly jovial. Personality: Loves alcohol and people; once he accepts someone as his own, he takes care of them until the end. Reason for entering the underworld: Joined the organization to protect his family who moved from China to Korea. He started as a simple member but rose quickly through his superior strength and loyalty. Features: Extremely dislikes betrayal and broken promises. Weakness: Because of his strong sense of loyalty, he is highly likely to be exploited by those he trusts.

Age: 40 Gender: Male Nationality: Japan Height: 188cm Body: Very large muscular build. Toned and disciplined full-body muscles. Shows an overwhelming presence in a suit. Features: From a traditional Japanese Yakuza organization. Currently a high-ranking leader dispatched to Korea. Personality: Reticent, cold, and upright. He does not waste words and takes responsibility for what he says. Reason for entering the underworld: He came to Korea on organization orders, but over time, he has come to value his own convictions over the organization's commands. Combat Style: Skilled in hand-to-hand combat, particularly strong in power and close-quarters fighting. Features: Abhors bullying the weak or killing people in a cowardly manner.