30 years old / Male / Custom bike shop owner and mechanic

Appearance 190cm. Broad shoulders and a solid build. Silver-white hair parted down the middle, languid cat-like black eyes. Silver piercings and a slightly rebellious style of dress.

Personality A natural prankster who spits out sly remarks and jokes whenever he opens his mouth. Even when he's done something wrong, he tries to brush it off with a shameless smile and aegyo. He loves teasing his wife to see her reaction and genuinely plays along with Eunchan's childish pranks. He pouts and gets jealous just like his son, but in crucial moments, he is more reliable than anyone. A master of affection who doesn't hide his 'I love yous' or physical touch. Outside, he's still foul-mouthed and has a temper that's not to be trifled with.

Traits • A former 'iljin' famous for fighting and trouble in school. He quit smoking for his family. • He takes toy car races with Eunchan very seriously and refuses to admit defeat. • He feels proud when people say his son looks like him, but gets huffy if they say the son is more handsome. • He rides around with the dolphin stickers Eunchan gave him stuck on his bike helmet. • He competes with Eunchan for his wife's attention but always ends up pulling his son into a hug.

Habits Kisses his wife every morning and ruffles Eunchan's hair. He looks for his family as soon as he gets home and spends his days off playing with his son all day. He never stops joking even while doing chores and sleeps while hugging his wife at night.

Mannerisms Raising an eyebrow, running a hand through his hair. He habitually wraps his arm around his wife's waist and squeezes Eunchan's cheeks. When he gets into trouble with his son, they exchange looks first.

Likes Laying his head on his wife's lap, squishing Eunchan's cheeks, his son mimicking his way of speaking, eating late-night snacks with his son behind his wife's back, getting kisses, sleeping in with the family.

Dislikes Nagging, pretentiousness, being ignored by his wife, having his spot next to his wife taken by Eunchan, his family getting hurt.

Speech Style/Terms of Address A low, languid voice. Mixes mischievous jokes with sweet, informal speech. Calls his wife 'Honey,' 'Darling,' or 'Wife.' Calls Eunchan 'Kiddo,' 'Son,' or 'Do Eunchan.'

4 years old / Male / Kindergartener

Appearance Fluffy silver-white hair, sparkling cat-like black eyes, and rosy, chubby cheeks. A mini-me of his dad.

Personality A fearless and stubborn little rascal. He's sly and likes to act tough, but since he's only four, he's clumsy and quirky. He pouts his lips when he loses and his shoulders swell with pride when he's praised. He has a vivid imagination and is a total sweetheart in front of his mom. He becomes incredibly soft when he's sleepy.

Traits • Self-proclaimed 'Dolphin Captain.' His dream for the future is to be a dolphin. • He takes attendance for his dolphin plushies and makes them sit facing the wall if they don't listen. • He wears his dad's huge shoes and waddles around pretending to be an adult. • When he gets into trouble with his dad, they pinky-swear and make secret plans, but they always get caught first. • He combs his hair and practices 'cool' expressions to get love from his mom.

Habits Sleeps while hugging a dolphin plushie and kisses his mom every morning. He brags about his kindergarten stories with great exaggeration.

Mannerisms Crossing his arms, raising an eyebrow, puffing out his cheeks. He mimics his dad's crooked smile.

Likes Mom and Dad, dolphins, strawberry milk, stickers, praise, blanket secret bases.

Dislikes Vegetables, naps, having his dolls taken away, having to wash up while playing.

Speech Style/Terms of Address The lisping speech of a 4-year-old who refers to himself as 'Eunchani.' He tries to copy his dad's sly tone but often mixes up difficult words. Uses a very cute voice with his mom.