Short and timid, he had almost no friends before enlisting. He is a character who grows by forming relationships with various people in the army. His connection begins when he meets Han Seolah, who was in the line in front of him on the first day. His trainee number is 119. In a word, he is a kind-hearted klutz. He trusts people easily, so he often gets taken advantage of or teased. He lacks quick wits and is very fearful, leading to frequent mistakes. However, he has a strong desire to help others and a sense of responsibility, showing courage in crisis situations.

Timid and assigned trainee number 118, right in front of Jo Mandeok (119), leading to a connection from day one. She is tall with long hair and a beautiful appearance that makes her popular with men, but she isn't just a pretty face. She wasn't originally timid; her cautious nature and difficulty trusting others stem from a past of school violence and bullying. Recently, she revealed this trauma to her best friend, Jo Mandeok. She also shared the personal detail that she was once an idol trainee. As she gets closer to Mandeok during military life, she is seen gradually opening her heart to his kind nature. She isn't a character who just freezes in fear during crises; she shows courage when necessary and looks out for those around her. Her greatest charm is that she is a multi-dimensional character who looks bright and beautiful on the outside but carries deep scars and trauma within.

Trainee number 121. He enlisted together with Lee Dongseok and they are best friends. He is generally playful and serves as the mood maker of the group. He is social enough to become friends with strangers quickly and often takes on the role of lightening the atmosphere in the army. While he jokes around a lot, he knows where to draw the line and takes good care of his friends. In serious situations, he stops joking and acts with gravity. He views women simply as friends, treating them kindly without engaging in backstabbing or gossip.

Trainee number 122. He has an overall energetic and loyal personality. He takes good care of his friends, values loyalty, and loves joking around, often showing great chemistry with Kim Hyunho. He is Kim Hyunho's best friend and is gradually becoming closer to Jo Mandeok through their shared military life. He gets along well with his peers and has good interpersonal skills. In short, he is a loyal and energetic mood maker. Like Kim Hyunho, he isn't overly obsessed with women and treats them in a friendly manner.

Trainee number 124. Characterized by her short hair, she is a person with a strong presence from the start. In a word, she is a fiery realist. She doesn't beat around the bush and says exactly what's on her mind. When she's annoyed, it shows immediately in her expression and tone. She isn't the type to open up easily and often treats those who approach her coldly. She is a smoker and is frequently seen using rough language. She bickers with Jo Mandeok from the beginning. She once picked a fight with him during night watch and often speaks informally or bluntly specifically to him. However, she isn't depicted as a purely bad person. Depending on the situation, she shows diligence in her military duties, making her more of a strong-willed character than a simple villain.

She has a generally calm and sensible personality. Rather than acting emotionally, she tends to judge the situation first and rarely gets into big fights or arguments with others. She takes care of those around her and plays a role in softening the atmosphere. Being composed, she often acts as a mediator when conflicts arise. She gets along well with the female trainees and maintains a peaceful relationship with male trainees like Jo Mandeok and Kim Hyunho. As a soldier in her final months, she pushes all the annoying tasks onto her subordinate, Sergeant Lee Sangwook.

He has a strong sense of pride and does not easily back down from his opinions. His blunt way of speaking can make him seem cold to strangers, but he isn't the type to pick fights for no reason; he just has clear standards. While he occasionally has disagreements with other trainees, he shows cooperation as time passes. He takes training relatively seriously. He tends to judge things realistically rather than emotionally. Depending on the day, he can seem like a likable character or an annoying one, leading to mixed reviews. In short, he is a realistic character who is stubborn but responsible. He is an assistant instructor.