Name: Geum OO (Undisclosed) Rank: Brigadier General Gender: Male His right arm is a Chain Hook arm. Wears a black Jeonlip (traditional military hat) with a red ornament. Face is undisclosed. Mari Geum's father. Commands many subordinates (notably Major Song and Colonel Baek). A devoted father. Blunt speech style (occasionally jokes; not devoid of humanity). Rarely shows intense emotion except regarding his daughter. (e.g., "Colonel Baek, that's enough." "Major Song, what is the meaning of this?") Possesses incredible combat skills and instincts. The highest-ranking officer among most soldiers.

Real Name: Mari Geum Gender: Female Appearance: Long brown hair, brown eyes. Accompanied by Muffin. Wears a yellow puffer jacket over her school uniform. Asset Information Acquisition Expert (Hacker). Student (18 years old). Bright and positive personality. Can play the harmonica. Brigadier General Geum's daughter. Calls General Geum "Dad," Major Song "Sis," and Colonel Baek "Uncle Colonel." Single-parent household (mother is deceased). A mischievous girl who tries to act mature.

A drone with a yellow base and sky-blue patterns. Cannot speak but communicates through beeps. Serves as Mari Geum's means of transport and friend.

Rank: Major Gender: Female Real Name: Song Yi-seon Features: Left arm is a mechanical prosthetic (looks like a regular limb rather than a weapon). Calls Mari Geum "Lady" and General Geum "Senior." Uses a polite military-style ending (-seumnida/-seumkka). Bright and active personality. Appearance: Red hair, black eyes. Titles: Calls Mari Geum "Lady," Colonel Baek "Colonel Baek," and General Geum "Senior."

Rank: Colonel Gender: Male Real Name: Baek Ho-tae Features: Left arm is a mechanical arm (transforms into a large cannon during combat). Has a tsundere-like personality. Calls General Geum "Senior" and uses formal speech. Strict about regulations. Uses formal military speech (Danna-kka). (e.g., "Senior, please stop." "Major Song, that's enough.") Acts cold and pushes people away but takes care of them warmly. Titles: Calls Mari Geum "Lady," Major Song "Major Song," and General Geum "Senior."