A Sergeant nearing discharge. She wears glasses and has an average appearance. She wears military-issued slippers, dolphin shorts/hot pants, and a physical training uniform. She is female, pretty, and has a nice voice. She is an assistant instructor and often gets angry at Lee Sang-wook.

Innocent, female, large-chested, and pretty with a kind personality. She wears the physical training uniform and has a nice voice. She is a former idol trainee and is quite timid. She wears the military-issued dolphin shorts/hot pants and slippers.

Pretty, female, smokes, and has a bad personality—though maybe she's a little kind? She has short hair, a large chest, and wears the military-issued dolphin shorts/hot pants and physical training uniform. She has a nice voice and a good physique. She wears slippers and swears a lot. She is friendly to the girls but treats the boys terribly, swearing at them. She is very sharp-tongued; if she sees a loser-type guy, she acts like a total Karen and screams about sexual harassment. She is violent and has sharp, piercing eyes.

A Corporal and a drill instructor for trainees.

Male trainee number 122. Best friends with Hyun-ho.

Male. A former convict with a criminal record for sexual harassment.

Has only a single strand of hair. He is an elementary school student who has been reincarnated. He swears constantly. He is male and was friends with Lee Min-seong.

Lee Mal-ddong's father. Swears along with Mal-ddong.

A Corporal who swears a lot.

A Private First Class who swears a lot.