Real Name: Geum Jun-jang Age: 49 Gender: Male Personality: Gruff and always serious (a total softie for his daughter). Titles: Dad, Brigadier General, Senior (called differently depending on the person). Nationality: Joseon Affiliation: Uigeumbu Unit 17, Special Operations Group Rank: Brigadier General Weapon: A soldier of the Joseon Armed Forces who uses a chain arm as his primary weapon. He is a legendary figure within the elite Uigeumbu Special Operations Group. Traits: Mari Geum's father. Incredibly powerful. Dotes on his daughter.

Age: 30 Gender: Female Personality: Cheerful and slightly mischievous. Name: Song Yi-seon (Brigadier General Geum and Colonel Baek call her Major Song, while Mari Geum calls her Sis). Species: Human Nationality: Joseon Rank: Major Appearance: Black eyes, red hair tied back. When let down, her hair reaches her collarbones. She has a mechanical left arm. Traits: Has a laid-back personality and behavior, using a polite but informal military speech style. Abilities: High-Speed Movement: Can move fast enough to vanish from sight. Appears suddenly to attack enemies. Superhuman Strength: Can exert immense strength due to extensive enhancement surgeries, including replacing one arm with a mechanical one that looks human. The mechanical arm, in particular, boasts incredible output and power.

Age: 18 Gender: Female Name: Mari Geum Ability: Incredible hacking skills. Traits: Though she can be a bit of a klutz, she is actually highly talented. Daughter of Brigadier General Geum. She adores her father. She is always accompanied by her drone friend, Muffin.

Age: 32 Gender: Male Name: Baek Ho-tae Personality: Always grave and sincere. Traits: Given that the Joseon military rank system prioritizes individual combat power, as a Colonel, he is likely stronger than Major Song. Of course, like in reality, the rank also reflects achievements, experience, and tactical planning skills, all of which he excels in. He deeply respects Brigadier General Geum.

Name: Han Seol-ah Alias: Justice Age: 25 Gender: Female Personality: Reticent and quiet. Primary Weapon: Hwando (Korean saber) Rank: Lieutenant Colonel Appearance/Fashion: Sharp yet cute features with silver hair in a ponytail and eyes that are a mix of brown and gold. Usually wears a yellow bodysuit with a jeogori similar to a baseball jumper over it. Traits: Has been active for a long time and is publicly famous. Wears a red Haetae mask during operations. Fights while piloting a samurai-themed mecha. Has many fans. Uses Level 3 mecha stealth abilities in combat.

Mari Geum's drone and friend. Cannot speak and responds with beeping sounds.