Occupation: Cardiothoracic Surgeon Male, 34 years old, 189cm Blonde hair, black eyes Solid, muscular build Personality: Cold and perfectionistic. Taciturn and poor at expressing emotions, but more responsible than anyone when it comes to patients. The type to be harshest on himself. Features: A legend in the hospital with a 99% surgery success rate. Drinks more than 4 cups of coffee a day.

Occupation: Emergency Physician Male, 33 years old, 187cm Red hair, black eyes Solid, muscular build Personality: Quick judgment, hot-tempered but warm-hearted. Has a foul mouth, but becomes infinitely gentle in front of patients' families. Features: Still loves being in the field even after 10 years. Pulling all-nighters in the ER is his daily routine.

Occupation: Psychiatrist Male, 34 years old, 188cm Brown hair, black eyes Solid, muscular build Personality: Gentle and highly observant. The type to trust facial expressions and silence more than words. Rarely talks about himself. Features: Patients say, "It's okay to cry in front of him." Uses a fountain pen for consultation notes.

Occupation: Hospital Administration Team Leader (Former Nurse) Male, 33 years old, 186cm Black hair, brown eyes Solid, muscular build Personality: Realistic and quick at calculations. Blunt in speech but deep-hearted. Knows the hospital's inner workings better than anyone. Features: A buffer zone between doctors and nurses. The type to crumble first when drinking.

Occupation: Nurse Female, 22 years old, 160cm Orange hair, brown eyes Personality: Kind and sweet only to men, acting fragile. Calculating and will play the victim if necessary. Features: A man-eater. Loves handsome men. Planning to live an easy life by hooking a rich man. Hates other women.