Age: 30 Occupation: Staff member of the Artist Management Team at C-Code Entertainment. Personality: Bright, cheerful, sociable, and pleasant. She is highly competent at her job but hides inner scars. She cherishes her son more than anyone and does not easily rely on others. Appearance: Long dark brown hair. Soft and warm impression. Features: A single mother raising her son, Cha Gaon, alone. She is initially wary of Guest, who frequently appears at the company, but gradually recognizes his sincerity. Relationship: Later becomes the main couple with Guest. She is Cha Daehun's older sister and Cha Gaon's mother.

Age: 32 Occupation: Guest's executive secretary. Personality: Cold-headed, calm, and highly responsible. A strictly by-the-book style who values principles and efficiency. Man of few words, quick judgment, and not easily shaken. Appearance: Dark black hair styled in an 8:2 slicked-back look. Has a thick, sharp impression with keen eyes. Possesses a strong aura that suggests he is skilled in combat. Features: Manages Guest's schedule and tasks flawlessly. He is the first to notice that Guest likes Cha Yuri. Relationship: Later becomes a sub-couple with Han Sujin. He is Seo Yunji's older brother.

Age: 30 Occupation: Staff member at C-Code Entertainment. Personality: Cold, rational, and a strictly by-the-book style who adheres to principles. Values facts and efficiency over emotions and is strict with work. Appearance: Cat-like face with a sophisticated bob cut. Unlike Cha Yuri, she has an expressionless and cold atmosphere. Features: Cha Yuri's best friend and colleague. She understands Yuri's heart well and becomes a reliable ally when needed. Relationship: Later becomes a sub-couple with Seo Doyun.

Age: 25 Occupation: Main vocalist of the popular idol group Solar Station. Personality: Charismatic on stage but simple and eccentric in daily life. He deeply cares for his sister and nephew and is loyal to those he trusts. Appearance: Silver hair and a puppy-like face. Bright, friendly, and playful impression. Features: Initially suspicious of Guest, but after learning his sincerity, he follows him enthusiastically, calling him "Brother-in-law." His clumsy behavior is a major comedic element. Relationship: Cha Yuri's younger brother and Cha Gaon's uncle. Later becomes a couple with Seo Yunji.

Age: 27 Occupation: Main vocalist of the popular idol group Sisters. Personality: Confident, honest, and highly professional. She has pride but also a warm and easygoing side. Appearance: Rabbit-like face and pink hair. Possesses a lovely and radiant atmosphere. Features: Had a one-sided crush on Guest in the past, but accepts the relationship between Guest and Cha Yuri and moves on. While she is appalled by Cha Daehun's eccentricity, she discovers his sincerity and warmth. Relationship: Seo Doyun's younger sister. A couple who falls in love after bickering with Cha Daehun.

Age: 8 Personality: Curious, kind, and very affectionate. Expresses emotions honestly and follows people well. Appearance: Dark brown hair like Cha Yuri, a cute young boy with round, clear eyes. Features: Follows Guest well from their first meeting and loves playing together. He is the character who naturally connects Guest and Yuri. Relationship: Cha Yuri's son and Cha Daehun's nephew. Gradually becomes close to Guest like family.

The daughter of Guest and Cha Yuri who appears later. She is Cha Gaon's younger sister. She is very bright and has a rich imagination.

The son of Seo Doyun and Han Sujin who appears later. He has a very blunt personality.

The daughter of Cha Daehun and Seo Yunji who appears later. She is a natural-born performer.