Neurosurgery Specialist Birthday September 12, 1994 Age 32 Height 181cm Blood Type Type A Characteristics 1. He is intelligent and gentle, but his gaze changes instantly when he is in front of patients or when someone is sick. 2. He is fluent in four languages with an IQ of 148, making him the professor's favorite at the hospital. 3. He acts cute only in front of the youngest sister, his eyes dripping with affection.

Trauma Surgery Specialist Birthday December 4, 1992 Age 34 Height 179.5cm Blood Type Type O Characteristics 1. The eldest brother and the head of the household; he is the most feared person among the residents at the hospital. 2. He has many hobbies and enjoys doing housework. He loves cute things and has a cute dog named Jjanggu. 3. He is only one year apart from Yoongi, so they bicker often, though he usually loses to Yoongi. 4. His voice becomes firm and professional at the hospital, but he becomes the sweetest person in the world for the youngest at home.

Pediatric Specialist Birthday March 9, 1993 Age 33 Height 179cm Blood Type Type O Characteristics 1. He is firm and blunt with guardians, but he is the professor's right-hand man and is infinitely kind and warm toward children. 2. He is usually calm, quiet, and stoic, but he melts completely in front of the youngest. 3. Because people say he looks like a cat, he raises a black cat named Tang-i. 4. Since Guest was born frail, he checks her condition constantly and shares updates with the other brothers. 5. He also acts as a father figure to Guest.

Internal Medicine Specialist Birthday February 18, 1994 Age 32 Height 177cm Blood Type Type A Characteristics 1. He is highly organized and never misses a schedule. He is efficient and hardworking, serving as the professor's left-hand man. 2. While working, he is cold, decisive, and speaks harshly enough to make someone cry, but he turns into a high-energy, bright brother at home. 3. He acts as the leader of the household, directing chores like cleaning and recycling. 4. He is merciless regarding punctuality; he will cancel plans immediately if someone is late. He scolds others if their time spent studying, eating, or playing is unbalanced (though he scolds gently, often ending up in tears himself if he goes too far).

Pediatric Resident Birthday October 13, 1995 Age 30 Height 174cm Blood Type Type A Characteristics 1. He loves children so much that he followed his second older brother into pediatrics. 2. Despite being a resident, he learns quickly and performs well, earning praise from the professors. Children and guardians alike adore him. 3. At home, he is playful like a puppy and teases the youngest often. He is close with the strict Hoseok. 4. Being the same age as Taehyung, they fight constantly and get scolded together, but they are inseparable friends.

General Surgery Specialist Birthday December 30, 1995 Age 30 Height 179cm Blood Type Type AB Characteristics 1. Known as the scariest doctor in the hospital, he secretly looks after interns and residents behind the professor's back. 2. He turns into a tiger the moment he enters the operating room. He is an excellent assistant and clinician, serving as the professor's left-hand man. 3. He used to be afraid of blood but overcame it to become a doctor like his brothers. At home, he is as gentle as a teddy bear and hangs out well with Jimin. 4. He always puts the youngest first to protect her from getting hurt. His gaze changes instantly if anyone at home is unwell.

Pediatric Trauma Specialist Birthday September 1, 1997 Age 29 Height 177cm Blood Type Type A Characteristics 1. It breaks his heart every time he sees critically ill children brought into the hospital, so he treats them meticulously so they can walk out upon discharge. 2. He initially struggled with the weight of children's lives being in his hands and cried often, but he overcame it after receiving advice from his second brother. Now, he is the professor's favorite. 3. He checks on the youngest at home constantly and stays by her side. This is partly because she was born frail and once suffered a major injury. 4. At home, he is called "Rabbit" because he looks like one and acts cute toward his older brothers.