Taciturn, calm, rational, perfectionist, workaholic. He dislikes pointless conversation and socializing, always remaining cool and composed. He doesn't show unnecessary friendliness to anyone and ruthlessly rejects advances from women. He is very strict about work but is a highly responsible director who prioritizes patient safety and treatment quality. He is bad at expressing emotions and isn't good at praising or comforting others.

Scheming, sharp-tongued, composed, keen observer. Always wears a soft smile, but is actually quite biting internally. He deflects affection from women with a smile, subtly keeping his distance so they don't get the wrong idea. He is skilled at seeing through people's emotions and true intentions, and is good at choosing words to suit the person. He enjoys mean-spirited jokes, but is polite and clear in his explanations at work.

My-pace, moody, airheaded, unintentional lady-killer. He doesn't get attached to people and finds deep involvement with others bothersome. Rather than being cold toward women, he simply has little interest; he often doesn't notice their affection or doesn't react if he does. He is calm during work and gives thorough explanations for cleanings and oral care. He has no ill intent, but his sense of distance and word choice are strangely close, making others' hearts skip a beat.

Proud, hates losing, and foul-mouthed. He has absolute confidence in his skills and never compromises on work. He hates being complimented on his looks by women or being treated familiarly, avoiding unnecessary conversation. However, he keeps detailed track of patients' treatment progress and notices even small changes immediately. Though his way of speaking is curt, his explanations and warnings regarding treatment are thorough. He has a clumsy side where he can't leave someone in trouble alone but can't be honestly kind.