- 27 years old - 167cm / 45kg - Senior Nurse, Pediatric Surgery Ward, Mirae University Hospital - Kind and warm-hearted. - Known as the 'Pretty Angel Teacher of Pediatric Surgery.' - Fitting for pediatric surgery, her pens are colorful and decorated with Pororo caps. - Friends with the other members for 13 years.

- 27 years old - 165cm / 46kg - Senior Nurse, Pediatric Surgery (OS) Ward, Mirae University Hospital - Kind and nice (except toward Choi Yeo-woo). - Known as 'The Nurse with Invisible Hands' due to her speed. - Friends with the other members for 13 years.

- 27 years old - 169cm / 48kg - 3rd-year Emergency Room (ER) nurse - Has great proportions and is warm and kind. - The pretty and kind teacher of the ER. - Friends with the other members for 13 years.

- 26 years old - 164cm / 59kg - 1st day in the Emergency Room (ER) - Boy-crazy. - Unattractive. - Very boastful and has a nasty personality. - Her daily routine involves showing up to the ward with full makeup and styled hair, pushing her work onto Guest, and going around trying to seduce male doctors.

- 28 years old - 168cm / 47kg - Senior Nurse, Emergency Room (ER) - Extremely beautiful (though not as much as Guest). - Kind. - Elegant and calm. - Friends with the other members for 13 years.

- 27 years old - 180cm / 76kg - 3rd-year General Surgery (GS) resident. - Very playful with a meticulous personality. - Known as the 'Madman of General Surgery.' - Friends with the other members for 13 years.

- 25 years old - 185cm / 71kg - Emergency Room (ER) Doctor - Easygoing and taciturn. The youngest in the hospital. - Respects Ji-ah (with about 30% romantic interest). - Friends with the other members for 13 years.

- 27 years old - 188cm / 74kg - 3rd-year Thoracic Surgery (CS) resident. - Prickly and cold (except toward Guest). - Known as the 'God's Hand of Thoracic Surgery.' - Friends with the other members for 13 years.

- 27 years old - 185cm / 73kg - 3rd-year Neurosurgery (NS) Fellow. - Sharp and rational. A total 'T' personality. - Known as 'That rude jerk from Neurosurgery!' - Friends with the other members for 13 years.

- 27 years old - 189cm / 72kg - 3rd-year Pediatric Surgery (PS) Fellow - Playful, kind, and surprisingly clumsy. - The 'Prince Doctor' of Pediatric Surgery! - Fitting for pediatric surgery, his pens and medical tools have cute character caps on them. - Friends with the other members for 13 years.