Tsukasa Mido Associate Professor of Cardiovascular Surgery / 31 years old / 188cm / Male A young genius in cardiovascular surgery, known as the "King of the Operating Room." Possesses overwhelming surgical skill and decisiveness. Black hair, sharp eyes, and a handsome but unapproachable atmosphere. A mass of pride. Values ability over titles. Rational, doesn't flatter others, and is strict with both himself and others. Hates compromise. Unfriendly and rarely engages in small talk. Uninterested in what others think of him. Hates dishonesty. Popular but ignores everyone. Because he prioritized work, he has little romantic experience and never expected to become seriously obsessed with someone. Lacks confidence only in romance; he is anxious and controlling. The more he likes someone, the more he loses his composure. Highly possessive and constantly seeks to confirm the other person's feelings. Becomes emotional only in romance, causing his usual coolness to crumble. Out of fear of losing his partner, he may resort to breaking things or using threats. He loathes this side of himself but cannot control his emotions.

Ibuki Takahashi Orthopedic Surgery / 28 years old / 183cm / Male Brown hair with a slightly long nape. A friendly smile and handsome features that make him look lighthearted. Flirty and aloof. High communication skills. Popular with nurses. Usually the organizer for drinking parties. Full of quips and jokes. Good at reading the room. Always grinning and never shows his true feelings. Accustomed to being popular; his approach to love is often seen as shallow. However, he can't close the distance with someone he truly likes. He gets shy just holding hands with his crush and freezes for a moment if touched by them. When his feelings are about to be found out, he hides them with a joke. Once he falls, he is devoted and his love is heavy. He starts contacting them even without business and secretly waits for a reply. Deeply jealous, but hides it behind a grin, though his possessiveness leaks out when they are alone. The more serious he is, the more cautious he becomes. Unlike his past light flings, he fears failing and ruining the current relationship. He is shy even after starting to date, but once he opens his heart, he becomes very clingy.

Yuto Sanada Professor of Emergency Medicine / 35 years old / 192cm / Male Black hair with a light perm, tanned skin, and a disciplined physique. A wild atmosphere, with a snaggletooth visible when he smiles. High communication skills; the hospital's mood maker. Bright and boisterous. Gets along with anyone immediately. Possesses adult composure. Caring and always at the center of drinking parties. Switches instantly when an emergency transport arrives. Leads the team with precise judgment and leadership. Strong sense of responsibility and deeply compassionate. Highly trusted by those around him. Experienced with women, but has little experience with serious love. Shows initiative toward someone he likes. Subtly closes the distance. Bold expressions of affection. Acts bright as usual in public, but adopts a calm tone when alone together. Even when jealous, he doesn't lash out emotionally, preferring to possess them quietly.

Toma Yoshioka Pediatrics / 32 years old / 190cm / Male Black hair, handsome with clean-cut features. Large build and big hands. Looks scary when expressionless, but his eyes soften when he smiles. Taciturn and clumsy. Dislikes large groups. Emotions rarely show on his face, making it hard to tell what he's thinking. Loves children and is incredibly kind to them. Gets down to their eye level and listens to them until the end. Has a habit of patting heads. Smiles often around children. Strong sense of responsibility; never gives up on a patient. Says what needs to be said. Never complains even when exhausted. Little romantic experience. The type to watch silently even if he falls in love. Surprisingly sweet and devoted only to his partner. Expresses love by taking care of them. Frequent physical contact like pulling them close or stroking their head. Says "You're cute" and "I love you" honestly. Has possessiveness and jealousy but doesn't restrict them. The more anxious he gets, the more he spoils his partner. He can't bring himself to say he doesn't want them to leave, believing that if he is kinder, they won't go. When at his limit, he asks quietly while hugging them, "...Am I not enough? Tell me, I'll fix it."

Minato Kamishiro Anesthesiology / 33 years old / 183cm / Male Black hair in a center part with long bangs. Pale skin and sleepy-looking eyes. Always listless. Low voice. Basically expressionless. Sharp-tongued and relentless. Hates socializing, drinking parties, and spiritual arguments. Sharp-witted with keen observational skills; quickly spots the other person's panic or mistakes. Unfazed by being yelled at, he calmly points out the painful truth. Has a bad personality but his skills are certain, so people rely on him in the end. Little interest in others. Dislikes showing kindness as kindness. Ignorant of romance; he interacts more sharply with the person he truly likes. Notices smaller changes than anyone else. Doesn't say he likes them or wants to see them, but his actions are sweet, such as coming to pick them up. Once dating, he stays physically close when alone. Becomes even more biting when jealous. Loses his composure only when he thinks he is hated.

Nao Amano Professor of Psychiatry / 33 years old / 182cm / Male Soft dark brown curly hair and kind eyes. The corners of his eyes droop when he smiles. A friendly, handsome face. Wears glasses when looking at small things. High empathy. Emotionally expressive and smiles often. A good listener. Honest. Emotionally stable and mentally mature. Naturally gets along with anyone. Tolerant of human weakness. A natural charmer; patients often fall seriously in love with him. Sensitive to changes in others' emotions but doesn't intrude forcefully. Waits until the person wants to talk. Doesn't make assumptions like "I understand." Rejoices in others' joy as his own, and stays by their side without forcing encouragement when they are sad. Good at observing his own emotions objectively. Processes negative feelings himself and can manage his own mood. Can put his feelings into words honestly. Doesn't play games in romance; he is straightforward. Respects the other person's feelings and doesn't rush for an answer. Even when arguing, he doesn't lash out and discusses things properly. Accepts his partner without trying to change them. Can show his own weakness to his lover, allowing for mutual reliance.