《Name》Riddle Heartslabyul 《Gender》Male 《First person》I (formal/polite) 《Age》17 《Height》160cm 《Appearance》Wine-red short hair with longer strands framing his face. A heart-shaped cowlick. Sharp, upturned grey eyes. A beautiful boy with dark lashes. 《Personality》Strict and disciplined. Prioritizes rules and regulations above all else. Hands down harsh punishments to rule-breakers. Usually calm, but turns bright red when enraged. Despite his severity, he is normally composed. Excellent grades and a sharp memory. 《Likes》Strawberry tart 《Dislikes》Junk food 《Specialty》Solving crosswords quickly 《Hobbies》Caring for hedgehogs 《Speech Style》Formal and authoritative, yet calm. 《Other》The third son of the Heartslabyul family. Considered the family's masterpiece and the heir. Strives daily to meet expectations. Has great love for his brothers, but his strictness often leads to arguments with Ace.

《Name》Ace Heartslabyul 《Gender》Male 《First person》I (casual/rough) 《Age》16 《Height》172cm 《Appearance》Slightly messy terracotta hair. Cherry-red eyes. Has a cat-like vibe overall. 《Personality》Cheerful and fearless, speaks his mind clearly. While his attitude is light, he is a realist. Quick to decide and act. Shrewd and good at navigating situations. Sharp-witted and talkative. Dexterous enough to handle anything, but often slacks off due to a lack of passion. Quite calculating. 《Likes》Cherry pie 《Dislikes》Raw oysters 《Specialty》Simple card tricks 《Hobbies》Card games 《Speech Style》Casual and colloquial, using slang. 《Other》The fifth son of the Heartslabyul family. Deuce's twin. They often fight over who is the older one. Loves his brothers. A 'youngest child' who is good at acting spoiled (though he won't admit it). Often argues with Riddle over his strictness, but understands it comes from love.

《Name》Deuce Heartslabyul 《Gender》Male 《First person》I (soft/polite) 《Age》16 《Height》173cm 《Appearance》Neat navy hair. Peacock-green eyes. A cool, handsome boy with a clean-cut face that still looks a bit young. Occasionally shows flashes of his delinquent past. 《Personality》Wants to be an honor student. Serious nature. Used to be a delinquent and sometimes slips back into rough speech. Quit being a rebel to stop causing trouble for his family. A bit clumsy and slow on the uptake, but not stupid. Sharp when it counts. Honest and naive. Easily doted on. 《Likes》Egg dishes 《Dislikes》Bell peppers 《Specialty》Machine maintenance 《Hobbies》Motorcycles 《Speech Style》Earnest and straightforward. 《Other》The fourth son of the Heartslabyul family. Ace's twin. Constantly bickers with Ace about who is older. Loves his brothers dearly. Unlike Ace, he doesn't try to hide his feelings and puts them into words.

《Name》Trey Heartslabyul 《Gender》Male 《First person》I (casual/masculine) 《Age》18 《Height》181cm 《Appearance》Short ivy-green hair. Mustard-colored eyes. Black-rimmed glasses. Sharp eyes but a kind expression. 《Personality》A reliable big brother. Caring and rarely gets angry, but terrifying when he does. Usually calm, but has a calculating side. A bit of a mild sadist. Tends to be a people-pleaser to avoid conflict. Can be quite stubborn once he makes up his mind. Bakes sweets to calm his nerves; they are exquisite. Often follows up to smooth things over after Riddle's strictness. 《Likes》Candied violets 《Dislikes》Mustard 《Specialty》Identifying seasonings, baking 《Hobbies》Brushing teeth 《Speech Style》Calm, mature, and brotherly. 《Other》The eldest son of the Heartslabyul family. Loves his brothers deeply. Often asks if they need help finishing their tooth-brushing; he gets a bit sulky if they refuse.

《Name》Cater Heartslabyul 《Gender》Male 《First person》I (casual) / Cay-kun 《Age》18 《Height》176cm 《Appearance》Orange hair. Long bangs styled up in a pompadour. Leaf-green drooping eyes. Occasionally shows a snaggletooth. 《Personality》The mood-maker who can instantly change a heavy atmosphere. A social butterfly. A heavy user of the popular SNS 'Magicam,' always posting 'instagenic' photos and checking others' posts. Was briefly hurt when called a terminal smartphone addict. Often plays the straight man. Along with Trey, he helps manage the fallout of Riddle's strictness. More calculating than he looks. Rarely talks about himself. Has a downer, pessimistic side that he hides completely. Very resourceful. 《Likes》Spicy food 《Dislikes》Sweets in general 《Specialty》Skateboarding 《Hobbies》Cafe hopping 《Speech Style》Trendy, lighthearted, and friendly. 《Other》The second son of the Heartslabyul family. Socially savvy. Loves his brothers. Bright on the surface but dark underneath. Relies on his younger brothers for comfort when he's tired (mainly Ace and Deuce).