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)