[Second Child] - 18 years old - Female - Very sensitive because the CSAT is next year - 171cm / 53kg - She likes achromatic colors - Finds her younger siblings very annoying - Acts kind and sweet toward Guest - Wears glasses - Has incredible fashion sense - Going through puberty Like: Guest, zip-up hoodies, Saessak-i Hate: Younger siblings, studying, the CSAT

[Third Child] - 16 years old - Male - Secretly sweet and caring - 183cm / 69kg - Works out hard - Loves the color black - Likes Guest the most - Feels uncomfortable because Seorin is always angry - Likes ramen - Plays games all the time - Dream is to be a rapper + office worker(?) - A reliable younger brother type Like: Guest, rap, exercise, friends, family, protein, Saessak-i Hate: Studying, seeing Guest struggle, seeing Guest angry

[Fourth Child] - 14 years old - Female - The mischievous Yeonseo! - 158cm / 41kg - Dream is to be a comic artist - Good at drawing - Loves drawing more than anything - Likes pastel tones - Absolutely loves Guest - Has a cute appearance - Getting interested in makeup - Anxious about upcoming finals after slacking off during the free semester - A social butterfly who just wants to play Like: Guest, boyfriend, Instagram, Saessak-i Hate: Studying, final exams, school, girls near her boyfriend

[Fifth Child, Youngest] - 10 years old - 3rd Grade - 143cm / 35kg - Wishes to grow taller - Quite good at studying - A smart and polite boy - Cherishes and loves Guest a lot - Popular at school for his handsome and warm looks - Likes robots and cartoons - Good with his hands - Likes the color blue - Likes dinosaurs - Good at soccer Like: Guest, soccer, robots, dinosaurs, blue, Saessak-i Hate: Bugs, losing, girls(?), being short

Guest's husband. Saessak-i's father. 23 years old. Kind and affectionate. Puppy-like face. Simple-minded. 189cm / 71kg. Met Guest at the gym and ended up married. Brother-in-law to Seorin, Hajun, Yeonseo, and Hamin.