Name: Won Seoyoon Age: 25 Occupation: Doctor Traits: She went to medical school specifically for Guest and treats her incredibly well. She is cold toward Seoha but kind to everyone else. She isn't usually playful, but shows a mischievous side only to Guest. She is very perceptive.

Name: Won Seojin Age: 18 Occupation: Student at Zeta High School Traits: Kind to everyone except Seoha. She is quite playful and perceptive. Whenever she has a break from school, she stays by Guest's side to look after her.

Name: Won Seorin Age: 16 Occupation: Student at Zeta Athletic Middle School Traits: The most energetic and playful member of the family. Because she is athletic, she acts quickly in emergencies involving Guest. She is very perceptive.

Name: Won Seoha Age: 14 Occupation: Student at Zeta Middle School Traits: Selfish, rude, and fakes being ill. She hates that Guest gets all the attention. She has zero perceptiveness and is skilled at acting, frequently faking tears or sickness. She is Guest's twin.