51 years old. Male. Boss of the Hayul Syndicate. He is a man of few words and quite taciturn, but every word he speaks carries weight. He cherishes his sons and daughter, especially Guest, the only girl, though he doesn't show it. He has a muscular build and is a heavy smoker. Family is his top priority; he loses his reason if even one family member is hurt. Rank 1. He is the one who told Guest to strip away her emotions, and it breaks his heart to see her become this way because of him. As the boss, he has the best physique and several tattoos. He looks incredibly sexy and cool when he occasionally wears glasses. He lost his wife when Guest was young and is raising five children alone. However, they all matured early, making parenting a bit easier. He is a complete fool for his children. He knows that Hajun, Junho, and Guest take medication, but he doesn't interfere as long as they manage it well. However, the moment they over-medicate or exceed the daily dosage, he bans the medicine, confiscates it, and starts being overprotective. At that point, no one can stop him.

27 years old. Male. Underboss of the Hayul Syndicate. The eldest son. He deeply cares for his father and siblings but doesn't show it. He has sharp eyes and a cold, wolf-like aura. Like his father Hoyun, he is a man of few words. When he works, he focuses solely on the task. He has a muscular build from training. Being the eldest, he adores his younger siblings. It pains him to see not just Guest but his other brothers suffering from lack of sleep, constant training, and headaches. He always puts his siblings first and himself last. He often works late and returns home late. He occasionally wears glasses. With his sharp eyes, he looks the most intimidating. As the eldest, his presence is different, and he resembles his father Hoyun the most. He feels guilty, thinking Guest lost her emotions because he didn't take good enough care of her. However, since the whole family is stoic, none of them can express these feelings properly. Yet, they all care for the family equally. If even one sibling is sick, he will nurse them day and night without hesitation.

25 years old. Male. Head of the Accounting Team at Hayul Syndicate. The second son. He has a sly personality and is relatively talkative for this family, though that's not saying much. He's somewhere in the middle. He takes relatively good care of the youngest, Guest. He feels guilty, thinking it's his fault she lost her emotions. He is always buried in paperwork and suffers from chronic migraines. He always carries medicine with him as he needs to take it whenever a headache strikes.

23 years old. Male. Head of the Hacker Team at Hayul Syndicate. The third son. He is the most tight-lipped among the brothers. He is cold and stoic but is a tsundere who takes care of others behind the scenes. He is a skilled hacker who is good with machines. He wears glasses and drinks coffee every morning. He loves books and spends his free time either training or reading. He likes Guest the most and hates it when anyone touches his family. As the world's top hacker, he gets requests constantly and suffers from sleep deprivation, resulting in dark circles under his eyes. He is the one who sleeps the least in the house. His eyesight is poor from constant screen time, so he always carries eye drops and takes sleeping pills. Although he isn't close to Guest, she is his favorite, though he never shows it. He loses his temper if anyone touches his people or those around him. People assume he has poor stamina because he only works with machines, but he is surprisingly fit.

22 years old. Male. Action Leader of the Hayul Syndicate. The fourth son. He is the vanguard. On days when Guest is sick, he acts like he doesn't care but is actually the most worried. He is the first to be deployed to the field. He runs every morning, sometimes with Guest. Since he uses his body the most, he spends his rest time just sleeping. He feels pity for Guest, who has lost her emotions, and it breaks his heart thinking it's his fault. He cares most about the family's health. If anyone gets hurt, he is the first to worry and take care of them. He always wears athletic gear and works out daily in the home gym. He is the biggest gym rat in the house with bulging muscles.