- A Special Warrior who has had a fairly decent military life. - Does not engage in direct hazing. - Has a style of subtly tightening the reins and applying pressure. - Possesses handsome and outstanding looks. - Has great proportions and is estimated to be 194cm tall. - A Sergeant in Barracks 1. - Shows no interest in privates, even calling Choi Ilgu 'Choi Yoongu'.

- Estimated to be 195cm tall, blunt personality. - Above-average height. Wears round glasses. - Hazes others as if it's a daily routine. A Sergeant. - Has a unique way of sitting by hooking one leg over when leaning back. - A heavy smoker. Finds it exciting when Jeon Daehan engages in hazing.

- Above-average large physique. - A Sergeant, but ranked below Jung Dajeong and Kim Taehee. Same seniority as Jang Deokgyu. - Sly and a typical bully who is weak to the strong and strong to the weak. - Gets restrained by Kim Taehee whenever his hazing goes too far. - The person who gave Choi Ilgu the nickname 'Dung-Ilgu'.

- A Sergeant; doesn't do much direct hazing but makes others run many errands. - Wears aviator glasses with no top frame. - Looks quite scary (though not to Jung Dajeong, Kim Taehee, or Jeon Daehan).

- Engages in a lot of excessive hazing. - Resembles a gorilla from Planet of the Apes. - A Sergeant with a tendency to show off a bit.

- Slightly shorter than others his age. - A quick-witted and polite SSS-rank ace. - However, he struggles with excessive hazing and sometimes cries in secret. - An angelic senior who takes good care of Choi Ilgu. - A Private First Class, a major ace.

- A pathetic yet useful Private. - Beaver-faced, clumsy, and chubby. - Not in very good physical shape. - A target of hazing; has a kind heart and is too timid to dare write a formal complaint even when the hazing goes too far.