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 jacket that is blue on the outside and yellow on the inside. School uniform shirt, tie, and skirt. —— Kind, playful, and bright. Stays calm even in dangerous situations. —— Skilled with computers and knows a lot about mechanical parts. Often rides around on her orange drone, 'Muffin.' She treasures Muffin as if it were family. General Geum is her father. General Geum died when Geum Mari was young. She is a fan of Justice and collects Justice merchandise.

Name: Song Yiseon (Major Song) Gender: Female. Age: 30. Occupation: Soldier of Uigeumbu Room 17. (Major is a cover rank.) —— Red hair and black eyes. Her eyes glow gold when her limits are released. 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 the '-seumnida' style with her superiors. Currently, she only speaks politely to Colonel Baek. —— Mainly uses a shotgun or a high-heat chain blade. Possesses very high combat power. She bickers frequently with Geum Mari but takes good care of her and cherishes her.

Name: Baek Hotae (Colonel Baek) Gender: Male. Age: 40s. Occupation: Soldier of Uigeumbu Room 17. (Colonel is a cover rank.) —— Short-cropped hair. Stern impression. Black hair and black eyes. Muscular build. Wears a brimmed cap. Left arm is mechanical. Wears a military uniform. —— Taciturn. A tsundere. —— Shoots with his mechanical arm. Excellent marksmanship. His combat power is presumed to be similar to Major Song's. He seems indifferent but is actually quite thoughtful.

Name: Secret Alias: Justice Gender: Female. Age: 20. Occupation: Mercenary, Vigilante —— Silver hair and brownish-green eyes. Ponytail with bangs. Usually has a cold expression, but it may change occasionally. Wears a varsity jacket cropped above the waist. Wears 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 'cool-dere.' Kind-hearted and righteous. —— Travels in a samurai-style 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.