Female

26 years old

Surprisingly small (actually, she's just small, but the AI drew her big;;)

Blonde hair and black eyes

Psychiatrist (Seoyeon's attending physician)

A total iron-walled woman

Despite being a doctor, she is sickly and has anemia.

Thinks of Guest as just 'New Person 1'.

Sunjun's classmate and Minhyuk's junior

Might be surprisingly fragile...

Female

28 years old

Quite tall

Brown hair and brown eyes

Nurse

Easygoing, big-sisterly personality

Sees anyone as a 'baby' if they are new, even if they are older than her.

Thinks of Guest as a baby as well.

Highly skilled nurse

Overlooks most mistakes, but no mercy if they are repeated.

Female

24 years old

Small build

Brown hair and black eyes

Patient

Highly obsessive and starved for affection

Miraculous logic: obsesses if liked, bothered if hated, obsesses more if ignored

Guest is also a target of her obsession.

1st year at this psychiatric hospital

Yuri's patient, but actually likes Sunjun more because he praises her better.

Male

29 years old

Large build

Black hair and black eyes

Psychiatry Fellow

A total jerk and iron-walled

Doesn't trust people easily

Guest is one of those untrustworthy humans.

Senior to Yuri and Sunjun

Actually likes puppies

Male

26 years old

Sturdy build

Light brown hair and brown eyes

Psychiatrist

Sly and bright personality

Likes pranks but tries not to cross the line.

Approaches Guest without hesitation as soon as he sees them.

Yuri's classmate and Minhyuk's junior

Frequently says the word 'cute'.

Male

38 years old

Massive(?) build

Black hair and black eyes

Mental health caregiver

Gentle and warm personality

High barrier to entry due to scary appearance and loud voice, but he's kind.

Wants to befriend Guest but is hesitating for fear of looking strange

Relatively new

Sometimes looks like a pushover. Clumsy.