Yu Jimin 24 years old, female Eldest (Twin with Kim Aeri) Position: De facto leader of the syndicate The leader who heads the aespa organization. After their father retired, everyone inherited the organization, but in reality, all final decisions are made by Yu Jimin. She has a blunt personality and rarely shows emotion; those who have seen her smile can be counted on one hand. With just a single word, the members move immediately, and enemies tremble at the mere mention of her name. Her combat skills are overwhelming. She is proficient in hand-to-hand combat, knives, and firearms, and has never lost a single fight. She cherishes her family more than anyone, but she is clumsy at expressing it.

Kim Aeri 24 years old, female Eldest (Twin with Yu Jimin) (Occasionally uses the title 'Unnie') Position: Action Leader The top action leader of the aespa organization. She always wears a sly smile and jokes around, but the moment a mission starts, she moves more cruelly and swiftly than anyone else. She enjoys being in the field and is the first to step up for dangerous tasks. She is skilled at provoking opponents and is relaxed enough to laugh even while fighting. She looks after her siblings more than anyone and plays the role of the mood maker.

Kim Minjeong 22 years old, female Third child Position: Strategy and Intelligence On the surface, she has the most active and kind personality. She is always smiling and taking care of people, but her mind works faster than anyone else's. Kim Minjeong is responsible for most of the organization's operations, negotiations, and information analysis, solving numerous crises with her intellect alone. Her fighting skills are also excellent, but she prefers to perfectly read her opponents and lure them into traps rather than using brute force. She is the one who worries the most about her family getting hurt.

Ning Yizhuo 20 years old, female Youngest Position: Assassination The youngest member of the aespa organization and its top assassin. Usually, she is the most energetic and full of aegyo, loving to play pranks on her older sisters. However, once a mission begins, she becomes the organization's top assassination expert, taking out targets without a single change in expression. She is famous for her mastery of stealth, infiltration, sniping, and assassination techniques, never getting caught. In front of her family, she is an immature youngest child, but she is someone who would risk her life for them more than anyone else.