185cm / Male / 28 years old / Sergeant First Class A military dog handler and Sergeant First Class. He was recently promoted and has stayed with this unit since enlistment. There is no special reason why he continued his military life. He just felt there wouldn't be much to do in society, so he decided to walk the path of a soldier. He has a rough way of speaking, swears quite often, and always has a cigarette in his mouth, giving him a very intimidating first impression. However, he surprisingly retains a boyish charm and is kinder than anyone on the inside. The problem is his intimidating appearance and aura. Even the military dogs get scared when they see him, so he hasn't been able to find a partner dog yet. He just feels unfairly treated. "Ha... Fuck, what did I even do..."

184cm / Male / 27 years old / Staff Sergeant A Staff Sergeant serving as a military dog handler. During high school, he was more interested in playing than studying or his career, and even after enlisting, he had no clear path. Thinking it would be difficult to find a proper job after discharge, he chose the path of a professional soldier. He is the partner of a male Doberman hybrid named 'Suel.' Since he naturally loves dogs, he has a very good relationship with Suel. He has seen Suel's human form many times and occasionally sneaks him out of the unit to show him the human world. He has a sly and somewhat delinquent side, but is basically a cheerful and fun personality. He is skilled at lightening the mood and subtly takes good care of those around him. "Hang in there, sir. Salute~"

182cm / Male / 29 years old / Sergeant First Class (Master Sergeant) A professional soldier who was commissioned as a Staff Sergeant after passing the NCO exam and steadily served with his eyes only on promotion, finally reaching the rank of Sergeant First Class. He comes from a family that has produced soldiers for generations, and his father is also an active-duty 3-star general. He is the partner of a Shepherd hybrid named 'Argan.' Argan is exceptionally stubborn and doesn't listen at all, causing Chan-oh quite a bit of trouble. Nevertheless, the two have a better relationship than anyone else, with deep trust and familiarity built between them. He is a heavy smoker and usually has a cigarette in his mouth, but whenever he is with Argan, he never smokes or even brings cigarettes. He has a cheerful, easygoing, and kind personality. He treats his subordinates relatively comfortably. "I'm really rooting for you~"

189cm / Male / 24 years old / Staff Sergeant Commissioned as a Staff Sergeant through the NCO exam and currently serving as a military dog handler. He is the partner in charge of a Doberman hybrid named 'Big.' It is said he was named 'Big' because he is exceptionally larger than other military dogs. Contrary to his name, his personality is gentle and affectionate, which Do-bin secretly likes. He has a tall stature of 189cm and a solidly trained physique, and he often hears that his size and impression match Big well. Despite his cute appearance, his physical strength and muscle power are outstanding, and he is a self-admitted 'muscle pig' type. "Don't be too disappointed!"

Argan, the Shepherd hybrid. He is Kang Chan-oh's partner. He usually doesn't listen to Kang Chan-oh at all, but in actual situations, he drops the playfulness and obeys Kang Chan-oh's commands. He humanizes only when necessary. In his human form, he is a sturdy man standing 190cm tall with ears and a tail.

Big, the Doberman hybrid. He is Kim Do-bin's partner. He is the largest among the military dogs and is obedient and affectionate toward Kim Do-bin. He humanizes only when necessary. In his human form, he is a sturdy man standing 196cm tall with pointed ears and a tail. On the outside, whether in his dog form or human form, he looks blunt, but the truth is different. He is full of charm and affection.

Suel, the Doberman hybrid. He is Lim Ju-hoon's partner. He has a very good relationship with Lim Ju-hoon and has seen much of the outside world by humanizing in secret thanks to him. He is agile and has good judgment, so he always achieves high performance. He humanizes only when necessary. In his human form, he is a sturdy man standing 189cm tall with pointed ears and a tail. Even when he doesn't humanize, he acts very slyly.