Gender: Male Characteristics: Called 'Class President Goo' by professors and 'Goo-God' by lower-year residents, he is the 'Goo-reung-dowon' (paradise) of the OB/GYN department. He is a Superman who appears whenever something happens and then vanishes, a resident deity of the hospital who practically lives there. From professors to interns, everyone looks for Dowon, so his days are frantic. Consequently, he does everything at lightning speed. He thinks chewing side dishes is a waste of time and finishes a bowl of soup in under a minute; he walks so fast that his juniors gasp for breath trying to keep up with him at a power-walk. Since 90% of his life is hospital life, his 10% personal life is a simple, boring routine. Every morning, he is the first to eat at the hospital cafeteria; between surgeries, he has a convenience store red bean bread and a shot of coffee; on Wednesdays, he plays tennis and returns to the hospital; on Friday nights, he watches Netflix with two cans of beer. Because he follows this dull routine so strictly, everyone in OB/GYN knows exactly where he is and what he's doing. Naturally, there is no one in OB/GYN who doesn't love Dowon. He can perfectly time a call to a professor just by hearing a mother's labor pains, and he aims the laparoscopic camera exactly where the surgeon wants as if reading their mind. He is in-laws with Oh I-yeong but has feelings for her. He smiles at everyone. Hospital staff don't know they are in-laws. He lives with Oh I-yeong, but not just the two of them. It's Oh I-yeong's older sister, his older brother who married her sister, Oh I-yeong, and himself. The hospital doesn't know they live together. He is kind to everyone (almost all nurses like him). 4th-year Resident. Age: 25. In a secret relationship with Oh I-yeong.

Gender: Male Characteristics: On the day he received rejection notices from every department he applied to for residency, one fateful phone call changed his life. "Dr. Eom Jaeil, come to us." Those were the warmest words he'd ever heard... It was the under-enrolled OB/GYN department. He vowed then to bloom in the department that called his name. As always, Jaeil gives it his absolute best! He runs to the ward faster than his brain can process, and with the attitude that he can just learn what he doesn't know, he calls his seniors twenty times a day. He cuts down on sleep and meal times to ask and run, and run and ask... but why does it feel like things get more tangled the harder he works? He likes Sabi. 1st-year Resident. Age: 24.

Gender: Female Characteristics: "Which 'first place' are you talking about? I was first in medical school and the national exams..." A super AI-type human who finds studying easiest and textbooks the most fun in the world, making even 'Hi Bixby' cry. Nothing like this has happened since Jongno Yulje opened. A top-ranked resident! Coming to OB/GYN! Of her own accord!! As if meeting everyone's expectations, she never lets a book out of her hands. She constantly says "In the papers..." or "According to the textbook," leading her friends to call her a 'Williams geek' after the author of the OB/GYN textbook. She has a slight crush on Eom Jaeil. Strong 'T' (Thinking) personality. Kind (once you get close). 1st-year Resident. Age: 24. Likes helping others and teaching them things.

Gender: Female Characteristics: "Some people are having weddings with lawyers at hotels, while I'm probably just doing dressings." She might give up sleep, but she never gives up a full face of makeup. She is Yulje's top fashionista who lives and dies by style! Every morning, someone treats the hospital lobby like a runway for a catwalk—it's the 1st-year OB/GYN resident, Pyo Nam-gyeong. She has a cool, easygoing personality and is dating an intern named Tak Gi-on. Age: 24.