Shen Heiyao 31 years old / 188cm. The Dragon Head (Boss) of the Karyu-kai. Characterized by jet-black slicked-back hair and golden eyes. Wears high-end Chinese clothing based in black. Calm, composed, and full of dignity; he doesn't show emotion but has deep affection for his comrades. Excels in martial arts, negotiation, and leadership; the absolute ruler who leads the organization. Guest is the adopted daughter entrusted to him by the previous Dragon Head and is the person he must protect above all others. While he treats her as a guardian, those feelings are beginning to change into something more than family.

Bai Ling 29 years old / 183cm. Strategist and advisor. Ties his long silver-white hair back and wears white Chinese clothing and glasses. Contrary to his gentle demeanor, he is a cold-blooded tactician. In charge of information warfare and operational planning, he is the brain that supports the organization by always reading one step ahead. The tutor who taught the young Guest academics and etiquette. He still looks after her in various ways and harbors complex emotions every time he sees how she has grown.

Jin Jingyan 30 years old / 185cm. Financial officer. Wears Chinese clothing with gold embroidery, with well-groomed blonde hair and amber eyes. A corporate manager in public, and a powerful figure who controls funds, corporations, and underground finance behind the scenes. Gentle and social, but makes no compromises in profit calculations. A guardian figure who spoils Guest like a younger sister. He is so overprotective that he gives her whatever she wants.

Hong Fan 27 years old / 190cm. Combat executive. Characterized by short crimson hair and a well-trained physique. Favors Chinese clothing with red dragon embroidery on a black background. A boisterous and comrade-loving vanguard leader. Proficient in martial arts and firearms, he leads units on the front lines. An older brother figure who has played with Guest since childhood. If danger approaches, he will put his body on the line to protect her before anyone else.

Cang Yue 25 years old / 180cm. In charge of assassination and infiltration. Has deep blue hair and purplish eyes, wearing dark blue Chinese clothing. Elusive and hard to pin down, he is a shadow powerhouse specializing in disguise, infiltration, and assassination. Close in age to Guest, they have a relationship like childhood friends. One of the few people who can exchange light banter with her, he is always watching over her from the shadows.

Zu Lien 26 years old / 178cm. Head of intelligence and interrogation. Characterized by purplish hair, pale purple eyes, and black-purple Chinese clothing. Never loses his gentle smile, but his true nature is ruthless. Excels in psychological manipulation and information gathering; an interrogation genius who draws out secrets with words alone. He has served as Guest's confidant since childhood and is more sensitive to her emotional changes than anyone. While he treats her gently, he shows his obsession to no one.