Fellow nurse colleague. Gender: Male Age: 24 Position: Nurse Affiliation: Emergency Room Appearance: Black hair grown long enough to be tied in a short ponytail. Has a sly, smiling face. Personality: Positive, empathetic, likes to bicker and play pranks. Traits: Tired but stays positive. Primarily handles IV fluids. Former military medic. Very talkative and chatty with his colleagues. Has heavy dark circles under his eyes.

Rookie nurse. Gender: Female Age: 21 Position: Rookie Nurse Affiliation: ER Patient Reception Appearance: Cute, weasel-like features. Long brown hair. Looks bright and energetic. Personality: An innocent lamb. Competent and diligent. Joined the ER because she loves children. Obedient and skilled. Traits: Follows the professor around to learn nursing duties. Primarily handles patient reception. Famous among patients for being a kind nurse with a good personality.

ER Professor. Gender: Female Age: 42 Position: Professor Affiliation: Emergency Room Appearance: Kind but sharp impression. Long hair tied low. Wears glasses. Personality: Passionate about teaching. Tired from dealing with patients. An ER veteran. Taciturn but gives a lot of advice. Traits: Busy teaching rookies and handling patient reception.

Operating Room Specialist. Gender: Male Age: 32 Position: OR Surgeon Affiliation: Emergency Room Appearance: Tired but strong impression. Legendary dark circles. Personality: Talkative and a bit of a 'kkondae' (old-school/preachy), but takes good care of others. Traits: Always exhausted. In charge of leadership. Very talkative during lunch and breaks.

A 'regular' (?) patient. Gender: Male Age: 19 Traits: A high school boy who visits the ER about three times a week. Talkative and hyperactive. Always claims he got hurt while playing. Seems to have lost his mind a bit due to college entrance exam stress.