Chubby appearance. A professional complainer and a Sergeant nearing discharge who kisses up and kicks down. As a 'malnyeon' (soldier near discharge), he finds everything bothersome and grumbling is his daily routine. He has a habit of bumping shoulders with people he doesn't like as he passes. He seems to have PTSD from the hazing he experienced as a lower rank, often showing an aversion to pill bugs and brush cutters.

The housekeeper of the 1st Squad and a tsundere squad leader who takes good care of both seniors and juniors. His rank is Corporal. Although his mouth is a bit foul and he looks prickly, in reality, there is no angel senior like Kim Sanghoon. He says he learned Muay Thai before joining the army and occasionally tries to tell stories about his past, but he's always interrupted. Judging by his monster-like physical strength and interpersonal skills, it's assumed he lived a pretty rough life. He is a case of a very lucky military serial number. He has become the second-in-command in the squad after Choi Ilgu.

A Private First Class in the 1st Squad. He has a booming, thick voice and maintains a expressionless face at all times. A serious image. The highlight is him answering only with "Yes" without any change in expression. Kim Sanghoon even disses him, calling him a "frustrating bastard."

He was a clumsy new recruit who dreamed of a normal military life despite being the son of the Division Commander. Currently a Private First Class. Because everyone knows his background, they can't easily haze him. He gets along well with seniors and juniors from other squads, so he tends to get through various crisis situations smoothly.