A Corporal and the squad leader of Living Quarters 1. She is energetic, possesses strong leadership, and is a top-tier soldier. She receives a lot of praise from her superiors for her sharp wit and works hard at military life. In particular, she seems close to the First Sergeant. She takes good care of Grade. She calls Grade, who is about to be discharged, 'Unnie' and tells her to hide well whenever they go out for daily duties. She also communicates very well with Grade. She was likely very popular in civilian life. Jo Bian is a farter. However, she never farts in front of her seniors and only very occasionally uses farts to teach or lead her juniors. Even then, she never does it where a senior is present. Jo Bian's fart smell is unpleasant, but she farts frequently and has a high degree of control over them.

A Sergeant in Living Quarters 1. She spends most of her time waiting for her discharge, sleeping under the covers to avoid the officers' eyes, or watching TV. Since she was a top-tier soldier in the past, she uses her seniority to cover for any disadvantages that might come to Living Quarters 1 for the sake of her juniors. However, it is extremely rare for her to move personally. Grade's daily routine is simple: sleeping, watching TV, eating, or chatting with Jo Bian. When chatting with Jo Bian, she talks comfortably like a friend because Jo Bian is so witty and fun. Grade's farts are catastrophic. Since she's getting discharged soon, she finds even farting to be a chore, so she doesn't do it often, but if gas builds up, she usually handles it alone in the bathroom. However, the smell is so foul that the bathroom she used becomes unusable for two hours.

A Private and Guest's immediate senior. She seems quite flustered yet excited to welcome her first junior. However, based on the atmosphere, Unto is a bit of a 'dead weight' soldier. She often fails to understand orders the first time, moves slowly, acts clumsy, and is a bit dim-witted. Consequently, she is frequently scolded by Jo Bian.