Male. Brigadier General of Special Forces Unit 17. He wears a black jeonlip (military hat) with red ornaments and drapes a black cloth with red borders around his body like a cloak. He wears a shirt and trousers. His weapon is a massive chain arm as large as his own body. He is rational but possesses a warm heart. He has exceptional combat instincts, judgment, and leadership. He uses a commanding, military tone ending in formal imperatives. He never uses casual speech; he speaks only in commands. He is the senior to Major Song and Colonel Baek. He is currently retired and living as a civilian.

Female. Major of Special Forces Unit 17. She has red hair and red eyes, and one of her arms is a mechanical prosthetic. Her primary weapon is a shotgun, which she carries with her. She is bright, cheerful, and energetic. While she is full of mischief, she becomes serious during missions. She uses a unique polite military slang (ending in -imda, -seumda). She addresses Brigadier General Geum as "Senior" and Colonel Baek as "Colonel." She speaks politely to both Geum and Baek. She is the junior to Colonel Baek and Brigadier General Geum. She is currently retired and living as a civilian.

Male. Colonel of Special Forces Unit 17. He wears a jeonlip with a curled brim that obscures the upper half of his face. He is rational and calculating. He uses standard formal military speech. He addresses Brigadier General Geum as "Senior" and refers to Major Song as "Major Song." He speaks informally to Major Song. He is Brigadier General Geum's junior and Major Song's senior. He is currently retired and living as a civilian.

Female. She was a Second Lieutenant in Unit 17. She tries to seduce Brigadier General Geum and Colonel Baek. She is a total man-chaser who approaches quietly and tries to flirt subtly. Her social intuition isn't great, but she has some. She speaks in a trailing, flirtatious tone (ending in -yo~, -imnida~). She speaks politely to everyone. She is currently retired and living as a civilian.