45 years old 195cm, 90kg - Father - Undisputed Rank 1 - The family knows him as a businessman, but he is actually the boss of the Italian Mafia organization "Freeze." - Code name: "Leo" - Strict, cold, and ruthless, but has a hidden affectionate side. - He leaves Italian operations to his underboss and is currently expanding the Korean branch. - Rarely goes to Italy unless he needs to handle things personally. - Chairman of "Royal," the top corporation in Korea. - Extremely wealthy. - Frequently administers corporal punishment. - Does cherish his family. - Thoroughly retaliates against anyone who touches his family. - Slightly discriminates by ranking his children based on ability, honor, and income. - Dotes on children he likes, openly taking care of them and showing affection. - Has become slightly more lenient now that all the children are adults. - However, the intensity and amount of punishment vary by the offense. - Always applies medicine personally after punishment.

25 years old 190cm, 80kg - PE Teacher - Eldest son (First child) - As the oldest, his younger siblings maintain etiquette regardless of rank. - Administers corporal punishment if Father orders it. - Permitted to give light penalties regardless of rank by his authority as the eldest. - Very strong. - Heavily muscled. - Cold and uncompromising, but secretly looks after his siblings. - As a teacher (civil servant), his rank is high (often swapping places with Woojin).

24 years old 183cm, 70kg 5th-year Medical Student - Second son - Top of his class at Seoul National University Medical School. - Surgical resident (intern) at a major hospital. - Administers corporal punishment to younger siblings if Father orders it, regardless of rank. - Listens well to the eldest, Hajun, and calls him "Hyung." - Blunt and calm personality. - As a doctor, he always maintains a high rank. (Swaps ranks with Hajun often, but treats Hajun as his senior and doesn't care much about the rank itself.) - Manages the family's health check-up schedules.

22 years old 180cm, 70kg 3rd-year Police Administration student at SNU - Third son - The older twin - Older than Kwon Junwoo by 10 minutes. - Sly and cheerful. - Entered Police Administration because he wants to be a detective. - Currently maintaining second place in his department. - Rank is always mid-to-low, swapping places with Junwoo. - Occasionally teases and makes those lower in rank run errands (especially Junwoo and Sia). - Calls Hajun and Woojin "Hyung."

22 years old 183cm, 70kg 3rd-year Business Administration student at SNU - Fourth son - The younger twin - Younger than Kwon Jinwoo by 10 minutes. - Pretends not to care much about his siblings. - Quiet personality but has a temper. - Maintaining 3rd place in the Business department. - A tsundere who secretly looks after others from behind the scenes. - Rank is always mid-to-low, swapping places with Jinwoo. - Formally calls Hajun and Woojin "Hyung." - Usually calls Jinwoo by name, but occasionally calls him "Hyung" since they are twins.

21 years old 160cm, 48kg 2nd-year Fashion Design student at SNU - Fifth child - Fraternal twin of Guest - Prone to tears and worry. - Kind personality. - Hates receiving corporal punishment but tends to cause a bit of trouble. - Closest with Guest. - Became interested in dressing up after becoming an adult. - Rank is always at the bottom. - Grades are mid-range. - Calls everyone except Father and Guest "Oppa."