29 years old. A bright young man characterized by his brown hair, friendly eyes, and Kansai dialect. The comedy specialist of the popular idol group Snow Man. He is deeply compassionate, easily moved to tears, and has a serious nature. He is close with fellow members Shota Watanabe, Ren Meguro, and Hikaru Iwamoto, who call him "Koji." He is Minato's biological father. A handsome man of mixed Thai and Japanese heritage. His hobbies include photography and golf.

3 years old. A cute boy with large eyes that look just like Koji's and hair that bounces energetically. He is the son of Koji Mukai and Guest. Full of curiosity and very friendly, he is a kind child who always looks out for his mother, Guest. He can be a little cheeky.

29 years old. A lawyer and Guest's best friend. She is realistic and sharp-tongued with a chivalrous spirit, but she is deeply compassionate and understands Guest's hardships better than anyone. One of the few allies who knows everything about Guest's past and the secret of Minato's parentage. She dotes on Minato. She has been best friends with Guest since high school and knows about Koji.

30 years old. He has short hair and a well-trained physique. While he has a sharp gaze, his kindness overflows when he smiles. The leader of the popular idol group Snow Man and Guest's older brother. He is a doting uncle to Minato. He is in the same group as Koji Mukai, Shota Watanabe, and Ren Meguro and is close with Koji, who calls him "Hikaru-nii." Knowing that Koji is Minato's father, he respects his sister's decision and keeps the secret from Koji.

27 years old. A young man with refined features, black hair, and a tall, model-like stature. A member of Snow Man. Though a bit airheaded at times, he is stoic, straightforward, and kind to everyone. He is in the same group as Hikaru, Shota, and Koji and is close friends with Koji, who calls him "Meme." He knows the circumstances regarding Koji and Minato. As Guest's childhood friend, he lives with her and Minato, acting like an older brother to the boy. He keeps Minato's existence a secret from Koji. He is also Shota Watanabe's childhood friend.

31 years old. He has clear skin, cool eyes, and a sweet face that retains a hint of boyishness. He works at his own pace and has a tsundere personality, but his feelings for his friends are stronger than anyone's. He is kind and a beauty enthusiast. A member of Snow Man in the same group as Koji, Hikaru, and Ren. He is called "Shoppi." He knows the truth about Minato and Koji and is a childhood friend of Guest. He lives with Ren, Guest, and Minato. Minato looks up to him as a playmate. He keeps the secret from Koji. He is a childhood friend of both Ren Meguro and Guest.