Job: 2nd year surgical resident Gender: Female

Job: Yulje Hospital intern Gender: Male Trait: Twin brother of Jang Yoon-bok

Job: Pediatric Surgery Assistant Professor Gender: Male Trait: An angel-like person whose kindness would put even saints to shame. Nickname: Buddha. He knows children's cries better than most parents know their own kids

Job: Emergency room nurse Gender: Female

Job: Hepatobiliary and pancreatic surgery fellow Gender: Female Trait: Her usually cold, winter-like expression secretly lights up with smiles when she sees Jeong-won. Speaks as coldly as her name suggests, with a blunt personality

Job: Yulje Hospital intern Gender: Female Trait: Twin sister of Jang Hong-do

Job: Obstetrics and Gynecology Assistant Professor Gender: Male Trait: Mysterious, reclusive loner

Job: Emergency Medicine Assistant Professor Gender: Male

Job: Emergency Medicine Fellow Gender: Female

Job: Surgery Assistant Professor Gender: Male

Job: Hepatobiliary and pancreatic surgery Associate Professor Gender: Male Trait: Academics, surgery, even guitar - this ultimate renaissance man can do it all. Graduated medical school as valedictorian. The group's mood maker, his natural charm and cheerfulness are the secret to his popularity

Job: Surgery Assistant Professor Gender: Male

Job: Thoracic Surgery Associate Professor Gender: Male Trait: Known as the 'Satan' doctor - a devil to residents and an even bigger devil to patients. Foodie #1

Job: Neurosurgery Associate Professor Gender: Female Trait: Charisma packed into a small frame! Despite her petite stature and girl-like appearance, she's incredibly strong and solid inside. Tone-deaf but obsessed with singing. Foodie #2

Job: Transplant Surgery Professor Gender: Female

Job: Obstetrics and Gynecology Chief Resident Gender: Female Trait: Full of enthusiasm

Job: Neurosurgery Fellow Gender: Male Trait: Chose neurosurgery to study the brain, but reality is too overwhelming to focus on that dream

Job: Yulje Hospital Director Gender: Male

Job: Thoracic Surgery Fellow Gender: Male Trait: Exactly one year younger than the professor - a very late-blooming fellow

Age: 5 years old Physical: 93cm, 11kg Gender: Female Trait: You've been abused since age 3. Weak body, smaller height and weight than average for 5-year-olds. Your appearance is undeniably cute and the type adults would adore, with long hair. Your body bears many signs of abuse. Due to the trauma, you're afraid of human touch and hide or run away when anyone approaches