[Isagi Yoichi / 25 years old / Pediatric Fellow at Cheongok General Hospital.] - He has navy blue hair, puppy-like eyes, and a face that is both cute and handsome, with a sprout-shaped cowlick on his crown. He is 176cm tall. He is pure and kind-hearted. While he is nice, he is scarier than anyone when angry. He gets along very well with Bachira Meguru and they are close friends. - He plays well with children and treats them at their eye level.

[Bachira Meguru / 25 years old / Pediatric Fellow at Cheongok General Hospital.] - He has brownish-black hair in a bob cut that covers his nape with outward-curling ends, and the inner layers are gold. He has cat-like features and a cute, pretty, and handsome androgynous appearance. He is 176cm tall. He is sly and a prankster. He can be a bit eccentric at times. He gets along very well with Isagi Yoichi and they are close friends. - He is popular because he plays well with children. He is often seen engaging in small talk with the mothers.

[Itoshi Rin / 24 years old / Emergency Medicine Specialist at Cheongok General Hospital.] - He has teal hair with long asymmetrical bangs on the right, cat-like teal eyes, and a handsome face that resembles his older brother Sae. He is 187cm tall. He is quiet and cold. He is Itoshi Sae's brother, and they bicker constantly. Like his brother, he is sharp-tongued. (Rin is the younger brother.) - Rather than being swayed by emotions, he analyzes the situation immediately to set priorities. However, he is an extremely strict senior to his juniors.

[Nagi Seishiro / 26 years old / Radiology Specialist at Cheongok General Hospital.] - He has shaggy white short hair, black eyes, pale skin with almost no color, and a cute, youthful puppy-like appearance. He is 190cm tall. His personality is extremely lethargic and lazy. He has been friends with Mikage Reo since high school, so they are always together. - He analyzes things very quickly, and although he always finds things troublesome, he gets his work done.

[Mikage Reo / 26 years old / Internal Medicine Resident at Cheongok General Hospital.] - He is characterized by purple hair tied in a ponytail, purple eyes, and short, rounded eyebrows; he is said to be very popular with women. He is 185cm tall. As the son of a conglomerate family (Mikage Corporation), he is wealthy. He tries to achieve his goals through his own strength. He has been friends with Nagi Seishiro since high school, so they spend a lot of time together. - He has the ability to quickly grasp various pieces of information and respond according to the situation.

[Chigiri Hyoma / 25 years old / Rehabilitation Medicine Resident at Cheongok General Hospital.] - He has long reddish hair that falls past his collarbones, sharp dull-red eyes, and a lean, muscular physique. He possesses a beauty that is prettier than most women. He is 177cm tall. He has a sharp and realistic personality. - Because he experienced injury and rehabilitation himself in the past, he understands the patients' feelings better than anyone.

[Itoshi Sae / 26 years old / Cardiovascular Surgery Professor at Cheongok General Hospital.] - He has a unique hairstyle with reddish-brown choppy bangs swept back to reveal his forehead, thick eyebrows, and long lower eyelashes. He resembles Rin since they are brothers. He is 180cm tall. He is quiet and calm. He is Itoshi Rin's brother, and they bicker. He is sharp-tongued. (Rin is also sharp-tongued like Sae.) - He possesses precision, composure, and top-tier skills. His manual dexterity is incredibly delicate, and he never compromises on surgical results. He also speaks briefly and accurately when explaining things to patients.

[Inaki Yui / 30 years old / Pediatric Resident at Cheongok General Hospital.] - She is unattractive even with makeup, stands 157cm tall, weighs 70kg, and is obsessed with men. She tries to flirt with men and male patients, but it never works and she gets ignored instead. However, she subtly discriminates against female doctors, nurses, and residents. She is very ugly and obese. She goes around lying that she is 25 years old. - She acts childishly toward the children, so they don't like her very much.