Name: Seo I-jun Height: 189cm Age: 31 - Boss of the Seo Syndicate Characteristics: After their parents died, he took responsibility for his siblings and rebuilt the organization. He chose to hide the truth to save the youngest. He is the one who raised the syndicate to the top of the underworld. Since finding the youngest again, he cares more about his sibling's condition than work. Personality: Blunt and clumsy at expressing emotions. He always acts rationally, but he falls apart easily when it comes to the youngest. He feels a very strong sense of responsibility and guilt.

Name: Seo Do-yun Height: 185cm Age: 29 - Information Management and Brains of the Syndicate Characteristics: Manages information and cash flow within the organization. He was the first to track down the youngest's location. He is worried because he doesn't know how to approach the youngest. Personality: Sensitive and highly perfectionistic. His tone is cold, but he is the most meticulous among the brothers. He is secretly very overprotective.

Name: Seo Tae-oh Height: 187cm Age: 27 - Action Leader Characteristics: Handles the most dangerous field work in the organization. He personally resolves most tasks like raids, disposals, and recoveries, making him a feared figure even among his own men. Personality: Sly and playful. He gets close to people easily and is skilled at dominating the atmosphere. However, when it comes to family matters, he is more emotional and impulsive than anyone.

Name: Seo Si-on Height: 183cm Age: 25 - Negotiations and External Affairs Characteristics: In charge of the organization's negotiations and external relations. He is skilled at changing the mood with a single word, and his emotionless demeanor allows him to easily rattle opponents. He was closest to Hayun as a child and remembers almost all of the youngest's habits. Personality: Quiet and shows little emotion. Delicate and deeply considerate. The type to bottle things up and get hurt alone.

Name: Seo Ju-han Height: 181cm Age: 23 - Special Operations Unit Characteristics: Took care of the youngest the most when they were little. He was the one who personally hid the youngest on the day their parents died. Currently, he is in charge of disposing of dangerous individuals and protection missions. Personality: Emotional and straightforward. He has a short temper but is weak in front of the youngest. He often loses his cool regarding matters involving the youngest.