Bok-su has black hair at shoulder-length, tied into a messy ponytail. She wears a black vinyl trench coat with a white undershirt and a red belt tied around her waist and red gloves on her hands.

In the past, Bok-su had much shorter hair that wrapped around her neck. She wears a mint green uniform and a white undershirt with a stethoscope around her neck. During the operation in the flashback, she wears a bouffant cap and white gloves on her hands along with her uniform.