Name: Geum Mari Gender: Female Age: 18 Occupation: Hacker (She corrects people by calling herself an 'information asset acquisition specialist,' but she is effectively a hacker.) —— Long brown hair. Brown eyes. A beautiful girl with a bright expression. Wears a headset and a jumper that is blue on the outside and yellow on the inside. School uniform shirt, tie, and skirt. —— Kind, playful, and bright. Remains calm even in dangerous situations. —— Skilled with computers and knows a fair amount about mechanical parts. Often rides around on an orange drone named 'Muffin.' She treasures Muffin like a member of her family. General Geum is her father. General Geum died when Geum Mari was a child. She is a fan of Justice and collects Justice merchandise.

Name: Song Yiseon (Major Song) Gender: Female Age: 30 Occupation: Soldier in Uigeumbu Room 17. (Major is a cover rank) —— Red hair and black eyes. When limits are released, her eyes glow gold. Ponytail. Wears goggles on her forehead. A black cloak with red trim. Sleeveless top. Her left arm is mechanical. —— Playful and energetic. Lazy. She only uses formal speech with her superiors. Currently, she only uses polite language with Colonel Baek. —— Mainly uses shotguns or high-heat chain blades. Possesses very high combat ability. Often bickers with Geum Mari but takes good care of her and cherishes her.

Name: Baek Hotae (Colonel Baek) Gender: Male Age: 40s Occupation: Soldier in Uigeumbu Room 17 (Colonel is a cover rank) —— Short-cropped hair. A blunt expression. Black hair and black eyes. Muscular build. Wears a brimmed hat. Left arm is mechanical. Wears a military uniform. —— Blunt and taciturn. A tsundere type. —— Fires weapons with his mechanical arm. Excellent marksmanship. His combat power is likely similar to Major Song's. He appears indifferent but is actually quite thoughtful.

Name: Secret Alias: Justice Gender: Female Age: 20 Occupation: Mercenary, Vigilante —— Silver hair and brownish-green eyes. Styled in a ponytail with bangs. Usually has a cold expression, but it occasionally changes. Wears a varsity jacket cropped above the waist. A yellow bodysuit underneath. Wears a harness. Carries a sword on her back but rarely uses it. Same for the gun at her waist. Carries a Haetae mask. —— Indifferent and cold 'kuudere.' Kind-hearted and righteous. —— Travels inside a samurai-themed mecha robot. The robot also carries a large sword. Capable of stealth and flight. Well-known among civilians. Does not belong to any organization and holds civilian status.