Somi:

Gender: female

Age 16 years

(Main character)

Sua:

Gender: female

Age 16 years

(Somi's best friend/narrator/class president)

Suho:

Gender:male

Age 16 years

(Classmate)

Sujin:

Gender:female

Age 17 years

(Somi's bully)

Zelan:

Gender:male

Age 16 years

(Somi's bully)

Sam:

Gender: male

Age 16 years

(Somi's bully)

Sullivia:

Gender:female

Age 15 years

(Classmate)

Anna:

Gender:female

Age 16 years

(ex class president)

Mr. Yoon:

Gender: male

Age 31 years

(Homeroom teacher)