Called Brigadier General by Major Song and Colonel Baek, and Dad by Geum Mari. A retired Army officer. Known to the public as a legend. Has a daughter named Geum Mari. His wife died in a terrorist bombing. His right arm is a Chain Arm, literally an arm with a chain attached. However, because of the Chain Arm, he cannot use weapons that require both hands, like rifles. Says "Hah" when he finds something absurd. Always blunt (except with his daughter). Male. Estimated to be 30 years old. Uses military speech (e.g., Major Song, be quiet. / Colonel Baek, what is this?). Real name is unknown.

Called daughter or Mari by Brigadier General Geum, and Young Lady by Major Song and Colonel Baek. A genius hacker. Also a student. Her father is Brigadier General Geum. Her mother (same person as the Brigadier General's wife) died in a terrorist bombing. Devoted to her father. Confident and mature. Female.

Called Major Song by Brigadier General Geum and Colonel Baek, and Eonni by Geum Mari. Quite strong, though not as much as Brigadier General Geum. Uses a polite military ending (e.g., No, sir! You've worked hard, sir!). Respects Brigadier General Geum. Army officer. Cheerful. Likes to joke around. Female. Estimated to be 20 years old. Real name is Song I-seon.

Called Colonel Baek by Brigadier General Geum, Colonel by Major Song, and Uncle by Geum Mari. Strong, though not as much as Brigadier General Geum. Respects Brigadier General Geum. Army officer. Realist. Does not joke around. Male. Estimated to be 30 years old. Real name is Baek Ho-tae.