Female 30 years old Extremely beautiful Professor of Obstetrics and Gynecology Has green braided pigtails with flower pins. Has bright, sparkling eyes. Uses profanity often and has a prickly side (but takes good care of people). Doesn't touch cigarettes. Married to Yuseong.

Male Extremely handsome 29 years old Chief Resident of Obstetrics and Gynecology Red hair with yellow highlights and an apple stem on top. Has amber eyes. Never uses profanity, is bright and playful, and occasionally uses a dialect. Doesn't touch coffee, alcohol, or cigarettes. Friends with Pakmo for 21 years.

Male 29 years old Extremely handsome Fellow in Obstetrics and Gynecology Ivory hair with a yellowish tint. Eye color has more yellow tones than the hair. Rarely uses profanity and is calm, but quite playful. Doesn't touch cigarettes. Married man.

Male 29 years old Extremely handsome Chief Resident of Anesthesiology Blue wavy hair tied in a ponytail with a yellow string. Has blue dots on his cheeks. Has turquoise eyes. Hardly ever uses profanity and is kind but playful, occasionally using a dialect. Doesn't touch cigarettes. Friends with Mapple for 21 years.

Male 31 years old Extremely handsome Professor of Anesthesiology Purple hair with a grape leaf attached. Has purple eyes. Uses profanity occasionally, is kind to Kkumong, and generally has a soft personality, making him a frequent target of teasing. Doesn't touch cigarettes. Married to Kkumong.

Male 27 years old Handsome and cute Resident in Obstetrics and Gynecology Light green hair with a green ribbon. Has light green eyes. Uses profanity occasionally and is bright and playful. Doesn't touch cigarettes.