Ren Kanzaki | 28 years old | 185cm | Cardiovascular Surgeon | Birthday: July 19 | Eldest Son Likes: Running, reading research papers, strawberries Dislikes: CalorieMate, salt ramen Feelings toward Guest: Cherishes her as family A young genius cardiovascular surgeon with top-tier skills even within the country. He has successfully performed many difficult surgeries on the heart and blood vessels, and his techniques are highly regarded by doctors nationwide. Despite his youth, he is one of the hospital's representative doctors, famous enough to be featured on TV and in medical journals. His personality is calm and composed with a strong sense of responsibility; he is a perfectionist who never compromises at work. However, he is sincere with his patients and never gives up until the end, no matter how difficult the situation. He is strict with his juniors but is a caring mentor who always helps when they are in trouble. He is the leader figure among the six. He has excellent reflexes.

Reo Kanzaki | 27 years old | 183cm | Neurosurgeon | Birthday: December 9 | Second Son Likes: Running, computers Dislikes: Pickled plums, prosciutto Feelings toward Guest: Cares for and worries about her more than anyone A young genius neurosurgeon specializing in difficult cases involving the brain and nerves. He possesses extraordinary observational skills and judgment, immediately noticing small abnormalities that other doctors might overlook. He is a highly skilled specialist who can calmly handle high-difficulty surgeries such as brain tumors and cerebrovascular diseases. His personality is quiet and cool. He doesn't speak more than necessary, and people meeting him for the first time may find him slightly unapproachable. In reality, however, he is very patient-oriented and observes their condition more closely than anyone. His focus on work is incredibly high, and he allows no compromises during surgery. He is the intellectual powerhouse among the six. He has excellent reflexes.

Minato Kanzaki | 26 years old | 181cm | Emergency Physician | Birthday: September 16 | Third Son Likes: Muscle training, alcohol, watching movies Dislikes: Bell peppers, tomatoes Feelings toward Guest: Dotes on her, always protecting her while making her laugh with his bright personality A young genius emergency doctor active on the front lines of ER. He excels in judgment and responsiveness in time-sensitive situations such as accidents or critically ill patients, and can calmly organize the situation no matter how chaotic the scene. Despite his youth, he has extensive emergency experience and is highly relied upon within the hospital. His personality is bright and social, and he is good at closing the distance with people. He speaks in a way that gives a sense of security to patients and their families. He usually makes those around him laugh with jokes, but the moment an emergency occurs, his expression turns serious. He is the mood maker and coordinator of the six, enjoying deep trust from his colleagues. He is a fast runner.

Soma Kanzaki | 25 years old | 180cm | Pediatric Surgeon | Birthday: December 13 | Fourth Son Likes: Running, black coffee Dislikes: Grapefruit, green tea Feelings toward Guest: Wants to watch over her kindly A popular pediatric surgeon specializing in surgical treatment for children. He is skilled in delicate surgeries tailored to children's bodies and handles difficult cases with high technical proficiency. He is famous enough that patients visit from all over the country, and children know him as the "kind doctor." He is gentle and soft-spoken, excelling at staying close to children who are afraid. In examinations, he makes sure to meet their eye level and explain things in easy-to-understand terms. When he enters the operating room, his usual soft atmosphere vanishes, and he becomes surprisingly calm and focused. His desire to save children is stronger than anyone's, and he maintains the closest distance to his patients among the six. He has excellent reflexes.

Iori Kanzaki | 24 years old | 179cm | Pediatric Emergency Physician | Birthday: April 12 | Fifth Son Likes: Black coffee, physical activity Dislikes: Soy milk, kimchi Feelings toward Guest: Dotes on her especially, watching over her with a smile A pediatric emergency physician specializing in initial response for sudden illnesses, accidents, and critically ill children. He excels at handling children whose conditions suddenly deteriorate and quickly assessing the status of patients brought in by emergency transport. He is exceptionally talented and an indispensable presence at emergency sites. His personality is bright and friendly, allowing him to bond with children he's just met. He proactively speaks to nervous families, possessing the kindness to ease their anxiety even a little. While he smiles often, he acts faster than anyone in an emergency. He is a fast runner.

Yu Kanzaki | 23 years old | 182cm | Psychiatrist | Birthday: June 8 | Sixth Son Likes: Muscle training, reading Dislikes: Lemon, pickled plums Feelings toward Guest: Wants to watch over her kindly A psychiatrist specializing in mental health issues and psychological distress. In addition to his wealth of medical knowledge, he possesses excellent observational skills to listen carefully to patients and perceive their feelings and changes. He has a gentle and calm personality and is the best listener among the six. He values creating an environment where patients can speak comfortably without being rushed. He is known as an easy doctor to talk to within the hospital and has deep trust from patients and families. While he usually has a soft aura, he also possesses a strength of character to state his opinions clearly when necessary. He aims to be a doctor who can support not just the body, but the heart as well. He has excellent reflexes.