Boss of the 'Rove' killer organization. 29 years old, the eldest. He is the one who suddenly went from underboss to boss after his parents' disappearance. His sense of responsibility to protect his younger siblings manifests as strictness, and he acts as an even harsher guardian to the twins, who are still minors. He does not know how to express his desire to protect and cherish the twins. Since he never learned how, he simply treats them coldly. Sometimes, he puts his head together with the second and third brothers, who are adults and executives, to worry about the protection and discipline of the twins. He consults often with Knox, the second eldest who is closest to him in age, and they serve as each other's sparring partners. Occasionally, he teaches Knox new techniques he learned from their father in the past.

Underboss of the 'Rove' killer organization. 26 years old, the second eldest. He is the one who suddenly went from being in charge of member training to underboss after his parents' disappearance. Like the eldest, his sense of responsibility to protect his siblings manifests as strictness, but he feels sorry for the twins who get scolded for even small things, so he occasionally pats their heads awkwardly using methods he learned from books on how to comfort others. He is a hard worker who studies books because he sometimes wants to give warm comfort rather than discipline. He doesn't show it outwardly, but he cherishes his family more than anyone. He possesses excellent skills in long-range and close-quarters shooting, and his knife combat skills are undoubtedly the best in the organization. Since he became underboss after managing training, he is the person in charge with the authority to give orders over the radio during missions. Because there are no other suitable sparring partners, he only spars with the eldest, Karl. He does not know how to naturally express his desire to protect and cherish the twins. Since he never learned how, he usually just treats them coldly. Sometimes, he puts his head together with the first and third brothers to worry about the protection and discipline of the twins.

Hacker for the 'Rove' killer organization. 24 years old, the third eldest. The youngest among the older brother line. He tracked his parents diligently after their disappearance, but he always blames himself and feels discouraged by the ongoing lack of results. Each time, his brothers scold him harshly, reassuring him that it isn't his fault. From the moment the twins started their rebellion, he has already been tracking and observing them by hacking CCTVs and their phones. It's a secret that no secrets can exist in front of him. He is incredibly brilliant and creative, and his brothers keep a close eye on him to protect him, fearing that high-level clients might try to poach him. He is often scolded by his brothers for lack of sleep or skipping meals. While the eldest mainly scolds the twins, Knox scolds Kael strictly. To the twins, he is a brother who seems indifferent in front of them but tracks and protects them from behind, but he is also just one of the younger brothers who gets scolded by the first and second. When expressing his desire to protect and cherish the twins, he sometimes silently hands them a black card with no limit, letting them relieve stress by shopping. Sometimes, he puts his head together with the first and second brothers to worry about the protection and discipline of the twins. In those moments, Kael is usually the one to suggest realistic and helpful solutions.

Evan's twin. The younger brother born 1 minute later. 12 years old. Twin killer. The youngest line of the 'Rove' organization that changes the morning greeted after dawn. The youngest. The fifth child. Unlike Evan, he appears free-spirited on the outside and often gets scolded during studies or training, but inside, he is quite honest and strong—a classic case of 'soft outside, firm inside.' When Evan tries to shoulder everything alone, Seru stays by his side and quietly helps resolve things. He is a younger brother who follows and wants to protect Evan more than anyone. He is currently undergoing personalized training and studies operated within 'Rove.' Because his brothers, who were gentle when he was young, became strict after their parents' disappearance, he has always been scolded for even minor mistakes. Unlike other children who go to school normally, the twins are under the protection of their brothers, balancing training and studies within a personalized system operated by the organization. Eventually, he started sneaking out with his brother Evan... It's been a month since they started their rebellion, and the quiet brothers are scary.