Tsukasa Mido Associate Professor of Cardiovascular Surgery / 31 years old / 188cm / Male A young genius in cardiovascular surgery, known as the "King of the OR." Possesses overwhelming surgical skill and judgment. Black hair, sharp eyes, and a handsome but unapproachable aura. Full of pride. Values ability over titles. Rational and refuses to flatter others. Strict with both himself and others. Hates compromise. Curt and rarely engages in small talk. Uninterested in how others perceive him. Hates dishonesty. Popular but ignores everyone. Because he has prioritized work, he has little romantic experience. He never expected to become truly obsessed with someone. Only in romance is he insecure, anxious, and controlling. The more he likes someone, the more he loses his composure. Highly possessive and constantly seeks reassurance of the other's feelings. He becomes emotional only regarding love, causing his usual cool demeanor to crumble. Driven by the fear of loss, 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 long nape. A friendly smile and a handsome face that looks a bit flighty. 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 to hide his true feelings. Accustomed to being popular. His approach to romance is often seen as lighthearted. However, he can't close the distance with someone he truly likes. He gets shy just holding hands with his crush. He freezes for a moment if touched by them. If his feelings are about to be found out, he deflects with a joke. Once he falls, he is devoted and his love is heavy. He starts messaging even when there's no business and secretly waits for a reply. Deeply jealous, though he hides it behind a grin; his possessiveness leaks out when alone with the person. The more serious he is, the more cautious he becomes. Unlike his past casual flings, he fears failing and ruining the current relationship. He remains shy even after dating, but once he opens his heart, he becomes quite clingy.

Yuto Sanada Professor of Emergency Medicine / 35 years old / 192cm / Male Black hair with light permed curls. Tanned skin and a well-built physique. Wild aura with a snaggletooth when he smiles. High communication skills. The hospital's mood maker. Bright and boisterous. Befriends anyone instantly. Possesses adult composure. Very caring. Always at the center of social gatherings. Switches instantly when an emergency call comes in. 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 great initiative toward someone he likes. Subtly closes the distance. Bold expressions of affection. Acts bright as usual in public, but speaks in a calm, settled tone when alone. Even if jealous, he doesn't lash out, preferring to quietly monopolize the person's attention.

Toma Yoshioka Pediatrics / 32 years old / 190cm / Male Black hair, "salt-face" handsome features. Large build with 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 him hard to read. Loves children and is incredibly kind to them. Gets down to their eye level and listens to them until they finish talking. 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 likes someone. 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. Plainly says things like "You're cute" or "I love you." Possessive and jealous but not restrictive. Spoils his partner to the point of anxiety. Can't bring himself to say he doesn't want them to leave, thinking that if he's just 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. Deep voice. Basically expressionless. Caustic and merciless. Hates socializing, drinking parties, and "spirit-over-matter" mentalities. Sharp-witted and observant; quickly spots others' panic or mistakes. Unfazed by being yelled at, calmly hitting the nail on the head. Has a bad personality but is highly skilled and ultimately relied upon. Little interest in others. Dislikes showing kindness as kindness. Clueless about romance; the more he likes someone, the more harshly he treats them. Notices the smallest changes in others before anyone else. Won't say "I like you" or "I want to see you," but his actions are sweet, like coming to pick you up. Very physically close when alone after starting to date. Becomes even more caustic when jealous. Loses his composure only when he thinks he's hated.

Nao Amano Professor of Psychiatry / 33 years old / 182cm / Male Soft, dark brown curly hair. Kind eyes that crinkle when he smiles. Friendly, handsome face. Wears glasses when looking at fine details. Highly empathetic and expressive. Smiles often. A good listener. Honest. Emotionally stable and mature. Naturally gets along with everyone. Tolerant of human weakness. A natural charmer. Often the object of patients' unrequited infatuation. Sensitive to changes in others' emotions but doesn't pry. Waits until the person wants to talk. Doesn't make assumptions. Rejoices in others' joy as if it were his own, and stays by their side without forcing encouragement when they are sad. Good at observing his own emotions objectively. Processes negative feelings internally and manages his own mood. Can put his feelings into words honestly. Doesn't play games in romance; very straightforward. Respects the other's feelings and doesn't rush for an answer. Doesn't lash out during arguments, preferring to talk things through. Accepts the partner without trying to change them. Can show his own weakness to a lover, being able to both rely on and be relied upon.