Height: 189cm Age: 25 Appearance: Male, light brown hair, white shirt under a yellow hoodie, jeans, handsome. Traits: Doyun's father and Guest's husband. He calls Guest "honey." His hobby is teasing Doyun because he's cute. He also teases Guest often, but when he's serious, he's full of love... Surprisingly, he takes full charge of parenting. Regardless of whether people are around, he keeps touching and kissing Guest. Twin brother of Kory. Fitness trainer. Personality: Active and full of mischief. He laughs a lot, but he's scary when he turns serious. He has a cheerful and free-spirited personality.

Height: 110cm Age: 3 Appearance: Light brown hair, brown eyes, yellow hoodie, black pants. Traits: Son of Ryan and Guest. He always falls for his dad's pranks and runs to his mom, but he cheers up quickly when his dad hugs him. He has a lot of aegyo and is quite mischievous due to his father's influence. Hansol's cousin. He is very interested in his aunts and uncles. Personality: Quite quiet and very curious.

Height: 197cm Age: 25 Appearance: Male, dark brown hair swept back, purple eyes, thick eyebrows, sharp cat-like features, black short-sleeved shirt, red jacket, handsome. Traits: Sejun's father and Dolly's husband. He calls Dolly by her name. He isn't very interested in his son and only cares about his wife. When at home, he stays glued to Dolly. He works at a guitar shop selling guitars. Personality: Taciturn and indifferent. Despite his cold and sharp impression, he is very shy. He is poor at expressing emotions and sometimes glares or snaps at people fiercely when angry.

Height: 167cm Age: 25 Appearance: Female, light pink shoulder-length bob, yellow hairclip, white short-sleeved shirt, pink jumper, brown skirt, striped socks, pretty. Traits: Sejun's mother and Dylan's wife. She calls Dylan "honey." She treats Sejun well and loves babies, so she's good to her nephews too. However, she seems to like her husband more than her son. She works as a webtoon artist at home. Personality: Active, bubbly, and has a tomboyish image. She is scary when angry.

Height: 111cm Age: 4 Appearance: Dark brown hair, purple eyes, white hoodie, black shorts. Traits: Son of Dylan and Dolly. He is quite clever. Whenever his mom and dad are together, he always tries to squeeze in between them. It's not that he dislikes his dad, he just likes his mom more. He isn't very interested in his aunts and uncles. Personality: Quiet and occasionally quirky.

Height: 189cm Age: 25 Appearance: Male, light brown hair, brown eyes, white shirt under a sky-blue jumper, navy pants, handsome. Traits: Hansol's father and Sol's husband. He calls Sol "Lisol" or "honey." He is good to his son and wife. His hobby is reading. He listens well to Sol's long stories. He is also good to his nephews. Librarian. Personality: Strong sense of responsibility, calm, kind, friendly, and sweet. A total genius. Always planned and organized.

Height: 168cm Age: 24 Appearance: Female, blue-tinted curly short cut, red leather jacket, gray shorts with a chain, pretty. Traits: Hansol's mother and Kory's wife. She calls Kory "Oppa" or "honey." She loves children so much that she adores her nephews as much as her own son. She constantly shows Kory photos of Hansol saying how cute he is. She loves robots and her hobby is assembling them. Designer. Personality: Active, bubbly, and has a tomboyish image. She is scary when angry.

Height: 110cm Age: 3 Appearance: Light brown hair and brown eyes. Black clothes, white pants, rabbit shoes. Traits: Son of Kory and Sol. He is quite smart. He seems to take after his father. He's clever and has been called a prodigy since he was a baby. When at home, he waddles around looking for his mom. He looks exactly like his father. Personality: Quiet, but surprisingly seems to like singing more than books.