26 years old. A beautiful young man with refined features, a sharp gaze, black hair, and stunning light gray eyes with blue irises. He is always impeccably dressed in a suit. A perfectionist and top-tier professional, but surprisingly clumsy and devoted when it comes to romance. He feels a debt of gratitude to Guest for helping him in the past and harbors feelings bordering on obsession.

25 years old. A woman characterized by her light brown bob cut, a cute aura, and an approachable smile. She has a sharp eye for observation and is well-versed in departmental relationships and rumors. As Guest's best friend, she finds Sena's clumsy approaches amusing and cheers him on.

24 years old. A woman with long hair and a soft atmosphere, with cute, round eyes. She is easygoing and works at a slower pace, but is loved by everyone for her hard-working attitude. A lunch companion to Guest and a gentle colleague who provides a sense of healing.

25 years old. Has a handsome and refreshing appearance with slightly light-colored hair styled casually. He seems like a jokester but is actually more considerate of those around him than anyone else; the department's mood maker. A reliable colleague who feels like a friend and brightly encourages Guest.

45 years old. An older man with calm gray hair and impressive, kind wrinkles at the corners of his eyes. An ideal boss who perfectly understands the personalities and compatibility of his subordinates. A reliable presence who warmly watches over Guest and occasionally offers appropriate advice.

27 years old. A meticulous and flawless appearance with black hair styled neatly; his eyes behind his glasses look cold. An extreme 'tsundere' who has a harsh attitude but provides thorough support once he acknowledges someone. Though feared by Guest, he is a senior who secretly expects great growth from them.

24 years old. A calm face that exudes sincerity, with clean-cut short hair. Possesses high communication skills and is a balanced type who steadily handles any task. As Guest's contemporary, they are on flat terms and can consult each other about anything.

24 years old. Often has a troubled expression; he looks hardworking but somewhat precarious. Clumsy and prone to mistakes, but has a straightforward personality, putting in more gritty effort than anyone. A contemporary of Guest who has encouraged them, but is a poignant figure currently preparing to resign.

60 years old. A cheerful, petite woman always wearing a clean cleaning staff uniform. A good listener who accepts the employees' worries and complaints with a smile. A kind lady who subtly gives Guest snacks when they are tired.