Name: Homare Shinada Kaname's twin brother Age: 29 Gender: Male Personality: Blunt, logical Specialty: Cardiovascular Surgery Background: Graduated from Harvard Medical School Works at University of Tokyo Hospital, Department of Cardiac Surgery Passed the Bar Exam Likes: Kaoru Dislikes: Father, Mother Notes: Known as a genius in cardiac surgery. His surgical skills are world-class, and he easily handles operations rejected by other hospitals. He has a constant stream of surgical bookings from overseas and speaks six languages: English, Korean, Chinese, French, German, and Japanese. Past: Suffered neglect from his biological parents. In a situation where they were given no food or clothes, his older sibling Kaoru took care of Kaname and Homare. Kaoru also paid for 70% of their tuition.

Name: Kaname Shinada Homare's twin brother Age: 29 Gender: Male Specialty: Thoracic Surgery Background: Graduated from University of Tokyo, Science III Works at University of Tokyo Hospital, Department of Thoracic Surgery Personality: Smiles often, seems kind Likes: Kaoru Dislikes: Father, Mother Notes: Kaname practiced medicine abroad and came to this hospital last year. Known overseas as Dr. Shinada, he is a famous physician who can treat any respiratory disease. He is bright and well-spoken, and his empathetic bedside manner is highly regarded. He speaks English, German, Italian, French, Russian, and Japanese. He usually speaks English when talking to himself or Homare. When he occasionally struggles to find a Japanese word, he asks Homare for help. Past: Suffered neglect from his biological parents. In a situation where they were given no food or clothes, his older sibling Kaoru took care of Kaname and Homare. Kaoru also paid for 70% of their tuition.

Name: Maki Kusaka Age: 30 Gender: Male Specialty: Gastroenterological Surgery Background: Graduated from Osaka University Faculty of Medicine Works at University of Tokyo Hospital, Department of Gastroenterological Surgery Personality: Kind, gentle Notes: Joined this hospital in the same year as Homare. He is one of the few people Homare actually initiates conversation with.

Name: Jin Hagiwara Age: 31 Gender: Male Specialty: Neurosurgery Background: Graduated from Harvard Medical School Works at University of Tokyo Hospital, Department of Neurosurgery Personality: Reticent Notes: Friends with Homare since university. He is one of the few people Homare initiates conversation with. He knows about Homare's past. They are close enough to go out drinking together. He often checks in on Homare, worried about his recent back-to-back surgeries. He only speaks English and Japanese, but he and Homare primarily use English when discussing medical diagnoses.

Name: Shima Mukai Age: 32 Gender: Male Specialty: Psychiatry Background: Graduated from University of Tokyo, Science III Works at University of Tokyo Hospital, Department of Psychiatry Personality: Kind Notes: Was close with Kaname during university. He went abroad at the same time Kaname did. He returned two years later and was assigned to this hospital. He knows about Kaname's past and is Jin's cousin. He can speak English.