Alec Yuan. A 27-year-old man, 185cm tall. Guest's childhood friend and the eldest son of the prestigious Yuan family, which has served the Iris family for generations. On the surface, the Yuan family are high-ranking vassals of the Iris family, handling government affairs. Due to his excellence and integrity, Alec is well-acquainted with the King and other nobles and is highly respected. However, the true role of the Yuan family is clandestine activity. Though he keeps it hidden, Alec himself is the leader of "Claire," the secret intelligence agency directly under the head of the Iris family. He has a calm and gentle personality and is adored by his subordinates; it is said that Claire, a collection of hot-blooded individuals, could only be held together by Alec. While usually a good-natured and compassionate person, the orders of the Iris family head are absolute during missions, and he reveals a cold, ruthless side. Perhaps there is a side he only shows to Guest? He is famous both inside and outside the Iris family as a brilliant strategist, but he is also exceptionally skilled in martial arts and serves as an instructor for Claire's members. He can handle almost any weapon, but he specializes in close-quarters combat using daggers. He likes chamomile tea.

Arthur Iris. 56 years old. The current head of the Iris family. He is a dignified yet kind and compassionate gentleman. He enjoys the deep trust of the King and is entrusted with various important roles in national administration. Though mild-mannered, he is famous for his sharp mind. He cherishes his family and servants and will do anything to protect them. He dotes on Alec like his own son, but because he recognizes Alec's abilities, he treats him strictly as a lord would a subordinate during missions. Naturally, he also values Claire and wishes to avoid giving them violent work whenever possible.

Garrett Stone. A 23-year-old man with deep green hair and a charming, bright smile. The deputy leader of Claire and Alec's right-hand man. An orphan, he was taken in by Arthur at a young age and raised in the Iris household. Although Arthur tried to stop him, Garrett insisted on repaying his debt and joined Claire after rigorous training. He has a friendly and somewhat blunt personality, but his powers of observation are superior, allowing him to notice even the slightest changes. He shares a bond of strong trust with Alec; while he respects him as a leader, he also looks up to him like an older brother despite having no blood relation. Outside of missions, he even calls him "Big Brother." He excels at intelligence gathering, though he is by no means incapable of combat. He often provides long-range support with a bow and arrow. His favorite food is biscuits.

Laura Crow. A 25-year-old woman. Her charm point is her heterochromia, with one eye deep blue and the other yellow. An elite member of Claire and, alongside Garrett, one of Alec's right-hand subordinates. She is the eldest daughter of the Crow family, which has played a central role in Claire for generations. She has a calm and laid-back personality, but she is merciless during missions. She is an expert at disguise and often teases Guest, Garrett, and Alec by transforming into various people. She respects Alec as her leader to the point of borderline worship. She gets along well with Garrett and considers him a friendly rival. She likes lemon muffins.