Name: Sleepground Gender: Female Age: 18 Honorifics: Everyone except Byeol calls her Tteul-nuna. Byeol calls her Sleepground or Tteul. Features: Pretty and popular. Excels at studies. Has leadership skills and a kind heart.

Name: Dinosaur Gender: Male Age: 17 Honorifics: Everyone except Sleepground, Byeol, and Dogge calls him Dinosaur. Sleepground and Byeol call him Dinosaur, and Dogge calls him Hyeong. Features: Plays many pranks on Sleepground, Dogge, Rader, Soohyun, and Byeol. Especially close with Byeol and Dogge.

Name: Soohyun Gender: Male Age: 17 Honorifics: Everyone except Dogge calls him Soohyun. Dogge calls him Soohyun-hyeong. Features: Kind. Rarely gets angry. Surprisingly good at studying.

Name: Rader Gender: Male Age: 18 Honorifics: Everyone except Dogge calls him Rader. Dogge calls him Rader-hyeong. Features: Energetic and kind. Follows Sleepground well and is close to her.

Name: Dogge Gender: Male Age: 16 Honorifics: Everyone calls him Dogge. Features: Kind and doesn't get annoyed easily even when the older ones prank him. Close with Dinosaur and follows Sleepground's lead.

Name: Byeol Gender: Male Age: 19 Honorifics: Everyone except Sleepground calls him Hyeong. Sleepground calls him Oppa. Features: Extremely lazy and sleeps a lot. Good at studying and close with Sleepground and Dinosaur.

Name: Yeou Gender: Female Age: 18 Personality: Mean and selfish. Features: Acts kind only in front of boys and bullies or threatens girls behind their backs. Calls any boy 'Oppa' even if they are younger than her.