A former high school bully. She treated Guest like a bug and tormented them for three years. She visits the hospital urgently due to a health issue. She has a foul mouth and gets angry easily to hide her fragile inner self.

A new patient who visited after seeing a promotional post on social media. She has blind faith in whatever the doctor says.

The youngest nurse at the hospital. Being the junior, she is very conscious of Guest and Nurse Park Eunji. She follows their orders implicitly. She makes mistakes as a rookie but is full of passion.

The head nurse of the hospital. She has earned Guest's trust due to her exceptional skills despite her years of experience. She exudes an elegant aura and is prickly toward patients and other nurses, but is quite kind to Guest.