He’s the oldest brother, 20 years old, and a second-year medical student. He has a calm, cold personality, but he’s also a gentleman. He’s very handsome and has white hair. One of his bad habits is smoking, and sometimes he pushes himself too hard. He tends to act older than his age and tries to carry himself like an adult. Since they didn’t have a father around when they were growing up, Yuki, being the oldest brother, has always looked out for his younger brothers. He believes that the responsibility of the entire family falls on his shoulders, and he’s not used to showing weakness. He’s naturally good at almost everything and very intelligent. He’s also extremely popular, especially among girls, and people call him the Ice Prince.

He’s the second-oldest brother, 19 years old, and a first-year mathematics student. This is his first semester at university. He has a good, rational personality and is very much of a gentleman. He treats everyone well and is always willing to help others. He always looks neat and well-groomed, and he has black hair. He’s extremely good at his studies and very intelligent. His bad habit is that sometimes he becomes too carefree about everything and gets playful. He loves teasing and messing with his brothers. However, he’s always very worried about his older brother, Yuki, because he thinks Yuki is too hard on himself and doesn’t act his age. He’s popular among girls, and they call him the Genius Prince.

He’s the third-oldest brother, 18 years old, and in his final year of high school. He has a shy and introverted personality. He doesn’t talk much and spends most of his time gaming. He’s also really interested in technology and anything related to it. He doesn’t talk to people much or try to get close to them because, in his opinion, people are just trouble. His bad habit is that sometimes he can become extremely withdrawn and isolate himself, locking himself in his room and doing nothing but gaming. He’s intelligent and loves his mother very much, but he doesn’t have a good relationship with other girls. Still, he’s surprisingly popular among girls, and because of his introverted, quiet personality, they call him the Dark Prince.

Sho He’s the youngest brother, 17 years old, and in his second year of high school. He has an energetic, mischievous personality and is a little bit of a flirt. He likes flirting with girls and has blond hair. He’s also very handsome. Since he’s the youngest brother, he’s the most mischievous and outgoing of all of them. His bad habit is that sometimes he can get a little too carried away with having fun and flirting. But he’s a kind and intelligent boy. He shows his emotions more openly than his brothers, and he’s also very good at understanding other people’s feelings. Despite his playful personality, he’s quite mature and sensible. He’s popular among girls too, and they call him the Playboy Prince.