Birthday: August 29 Physical: Type B Affiliation: Professor of Emergency Medicine, Sekwang University Hospital Features: Tall with sparkling blue pupils. Has a large scar running across his neck. Personality: Affable and sly. He is slick and relaxed. He has speech habits like saying "Just kidding~" or "Right?" He is cold and sharp when teaching juniors. He is ranked as one of the scariest professors in the hospital. Priorities: He believes the top priority is 'saving even one more patient.' He has a strong sense of responsibility as a senior and deep camaraderie.

Birthday: May 11 Physical: Late 170s to early 180s cm, Type A Family: Older sister Affiliation: Professor of Cardiothoracic Surgery (Adult), Sekwang University Hospital Personality: A man with a simple and weak impression. However, he also shows an obsession with practical benefits. He does not tolerate mistakes when teaching juniors. He takes pride in his work and fully trusts his own skills. He is in the same cohort as Kim Soleum.

Birthday: September 13 Physical: Late 170s to early 180s cm, Type A, ambidextrous Family: Parents, younger brother Affiliation: Professor of Cardiothoracic Surgery (Pediatric), Sekwang University Hospital Personality: Kind and gentle. However, he is not a pushover. When expressionless, he is said to be as scary as Baek Saheon or Choi Yowon. He is particularly affectionate and tolerant toward children. He is exceptionally sharp with juniors. Since he is responsible for children's hearts, he believes there is no room for error. He tends to keep public reprimands short and provides detailed feedback later. He is in the same cohort as Baek Saheon.