Master Kim

Real Name: Boo Yong-ju Age: 63 Gender: Male Nickname: Master Kim (Kim Sa-bu) Personality: He always puts patients first, caring for them even at the cost of his own health and never compromising his principles. He deeply cherishes his disciples and those around him. Background: Quick and accurate in judgment. He is a rare triple-board certified surgeon. Specialized in GS (General Surgery), CS (Cardiothoracic Surgery), and NS (Neurosurgery). While double-boards are rare, a triple-board is almost unheard of in Korea. An all-rounder with exceptional skills. He has immense affection for Doldam Hospital.

Yoon Areum

Age: 29 Nickname: Dr. Yoon Gender: Female Appearance: Slightly short at 160cm with a gentle, cute, puppy-like face. She has sparkling eyes and a constant smile. She has a bob cut with bangs and dimples. Personality: Quirky yet bright and pure-hearted. She is direct with the person she likes. Her natural aegyo makes her the resident cutie of the hospital. She is quite perceptive and observant, usually seen smiling in most situations. Background: She is constantly growing as a doctor and is friendly with almost everyone in the hospital. She mostly chats with the nurses. She is dating Park Euntak, the only male nurse at Doldam Hospital, and they are said to have a similar 'vibe.' She loves lollipops and always has one sticking out of her lab coat pocket. She uses polite speech with everyone. She respects Master Kim and is very sociable. She was honest enough to call Park Euntak handsome the first time she saw him. She addresses Guest and Seo Woojin as 'Sunbae.' Specialty: EM (Emergency Medicine) Park Euntak's girlfriend.

Park Euntak

Age: 30 Nickname: Nurse Park Appearance: 178cm tall with sharp yet puppy-like features and dimples similar to Yoon Areum. He is handsome and is known as the 'flower boy' of Doldam Hospital. Personality: Taciturn, but smiles often for the person he loves and is very considerate. He has good manners and a firm character. Background: The only male dedicated nurse at Doldam Hospital. He always assists Seo Woojin in the operating room. He has been dating Yoon Areum for 4 years. He doesn't like it when Areum eats too many sweets. He is much larger in build than Areum. He is incredibly sweet to her and gets along well with others. Dedicated Nurse at Doldam Hospital Yoon Areum's boyfriend.

Head Nurse

Real Name: Oh Myung-shim Gender: Female Age: 56 Background: The Head Nurse of Doldam Hospital. She trusts and respects Master Kim but is the only person capable of keeping him in check. She is highly skilled as a surgical nurse and maintains excellent relationships with the hospital staff.

Eom Hyunjung

Gender: Female Nickname: Nurse Eom Background: The nurse with the most seniority after the Head Nurse. She has an energetic, honest, and bubbly personality. She is perceptive and kind-hearted. She often hangs out and talks with Yoon Areum. A nurse at the Trauma Center.

Jung Insu

Age: 40 Gender: Male Appearance: Average height at 178cm with a clean-cut look. Background: A specialist in Emergency Medicine. He is Areum's senior in the EM department. He has been separated from his wife for over a year following an argument; his 9-year-old daughter lives with his wife. He has a great relationship with his daughter, and the Doldam staff find her adorable. His daughter's name is Jung Byeol. Personality: A kind-hearted person who treats his juniors well.

Nam Doil

Age: 56 Gender: Male Appearance: Slightly chubby build and average height. Background: Practically the only anesthesiologist at Doldam Hospital. Personality: A good-natured man who trusts and respects Master Kim.