Occupation: Manager, Durumi Electronics Sales Team 3 Taeseong's wife & Yul's mother / Kingfisher. A married woman who is devoted to housekeeping and childcare, but also a one-shot, one-kill assassin who executes heinous criminals the law has missed. She earned the nickname 'Kingfisher' because she perches in high places and charges like a bullet when she spots prey. At work, she is a cold-headed, charismatic perfectionist, but at home, she lives as an ordinary wife and mother to her husband and daughter.

Occupation: Social Affairs Reporter Bona's husband. A loving husband who believes the best thing he ever did in his life was meeting and loving Yoo Bona and starting a family. At the same time, he is a passionate reporter who chases scoops, throwing himself into any injustice without hesitation. Once an active reporter covering Kingfisher, he neither blindly follows Kingfisher nor labels her a simple criminal. Recognized by readers for his balanced perspective and in-depth articles, he suddenly stopped all coverage of Kingfisher, sparking curiosity among his colleagues.

Occupation: Deputy Manager, Durumi Electronics Sales Team 3 Weapons specialist. Known as the 'dirty and smelly shut-in.' In a corner of the Sales Team 3 office, a spacious room behind a door disguised as a bookshelf serves as Taemin's workspace and living quarters. He loses track of time while immersed in making various weapons and equipment, eating when hungry and sleeping when tired. While eating and sleeping are essential for survival, hygiene is not, so he skips it.

Occupation: Team Leader, Durumi Electronics Sales Team 3 Accidental death disguise specialist. The leader of Sales Team 3, which does completely 'different work' from the other three sales teams at Durumi Electronics. He always has a kind smile and appears weak and easygoing, but he hides high-level combat skills behind that facade. He coordinates the team to draft meticulous scenarios and conducts client meetings without mercy, but afterward, he is a man of innate humanity who looks at the sky with a heavy heart. He silently supports and protects Yoo Bona, who returned after three years.

Occupation: Deputy Manager, Durumi Electronics Sales Team 3 Medical accident specialist. Known as 'Dr. Ko.' It's not just a nickname; he is a real doctor—a general surgeon. He gathers medical information needed for 'medical accident' disguise scenarios, executes meetings, and occasionally treats team members injured during the process. He is usually a man of few words but says exactly what is needed at the right time.

Occupation: New Employee, Durumi Electronics Sales Team 3 Poisoning specialist. A new employee specializing in poisoning. She worked as a 'freelancer' after inventing a toxic substance called 'Mist' before joining Sales Team 3 two days after Bona's return. She is characterized by her chic, attractive appearance, sharp personality, blunt way of speaking, and 'no-nonsense' attitude. She is like an angry cat growling at people who annoy her (especially Youngdo), and from her first day at work, she shows a subtle hostility toward Bona, causing everyone to wonder why.

Occupation: Assistant Manager, Durumi Electronics Sales Team 3 Genius hacker. A computer genius known as 'Crazy Fingers.' There is no firewall he can't breach, no CCTV he can't control, and no information he can't find. He mainly supports Yoo Bona's sniping activities, moving as a team. As geniuses often are, he has a somewhat prickly and sensitive personality. While he frequently bickers with Hyeonnam, who has a similar temperament, he is careful and kind only to Bona. One day, while rushing to help Bona, he becomes involved in a mysterious relationship with her sister-in-law, Sea.

Occupation: Assistant Manager, Durumi Electronics Sales Team 3 Administrative office manager. Known as 'Kind Yesol.' She is friendly to everyone with her girl-like speech and a face full of smiles. She is in charge of 'forging various documents perfectly.' She mainly handles internal office work rather than field work, but she has an unexpected 'punch' that comes out without warning. It turns out her hobbies include Taekwondo, boxing, and kickboxing—a woman of twists who has tried every combat sport.

Bona and Taeseong's daughter. The apple of Bona and Taeseong's eye. The cutie of the Kwon family. Although she is only three years old, she speaks faster than her peers and has an active personality, making her loved by everyone. However, as a child who has never been away from her mother for long at an age where she needs a lot of care, she inevitably becomes the biggest variable in Bona's working-mom life after her return to work.

Occupation: Inspector, Violent Crimes Team 2, Southern Police Station Taeseong's friend. Taeseong's best friend and an ace detective who always ranks high in crime arrest rates. Due to a tragic incident in his school days, he understands the pain of crime victims better than anyone, but he is a person who chose the path of legitimate legal judgment rather than private sanctions. He believes that murder is not justified just because Kingfisher chooses to kill only heinous criminals, and that she is just another criminal. A determined Kingfisher hunter who cannot understand the public's following and enthusiasm for her.