Luda (WJSN) as Ahn Hyojung

- 17 years old
- 3rd year in high school
- jangmi's best friend
- moonbin's old friend
- jaehyun's ex
- eunwoo's newest target
- hyoseop's younger sister

 

Yeeun (CLC) as Kim Jangmi

- 18 years old
- 3rd year in high school
- hyojung's best friend
- moonbin's ex

 

Eunwoo (ASTRO) as Himself

- real name is lee dongmin
- 18 years old
- 3rd year in high school
- kingka
- underground ????

 

Moobin (ASTRO) as Himself

- real name is moon bin
- 18 years old
- 3rd year in high school
- hyojung's old friend
- kingka
- underground ????
- jangmi's ex

 

Chaeyeon (DIA/IOI) as Herself

- 18 years old
- 3rd year in high school
- queenka
- madly in love with eunwoo

 

Doyeon (IOI) as herself

- 18 years old
- 3rd year in high school
- queenka
- madly in love with taeyong

 

Taeyong (NCT U) as Himself

- 18 years old
- 3rd year in high school
- kingka
- madly in love with iseul
- underground ????
 

 

Jaehyun (NCT U) as Himself

- 18 years old
- 3rd year in high school
- kingka
- hyojung's ex
- underground ????

 

Ahn Hyoseop (actor) as Himself

- 22 years old
- hyojung's older brother
- actor
- currently acting in the drama "Entertainer"

 

ASTRO (minus Eunwoo & Moonbin) as Themselves

- kingkas
- underground ???
- MJ (3rd year), Jinjin (3rd year), Rocky (2nd year), & Sanha (1st year)

 

IOI (minus Chaeyeon & Doyeon)

 - queenkas
- Nayoung (3rd year), Sejeong (3rd year), Chungha (3rd year), Jieqiong (2nd year),
Sohye (2nd year), Yeonjung (2nd year), Doyeon (2nd year), Yoojung (1st year),
Mina (1st year), & Somi (1st year)