“Useless High School” is a school renowned for its sexual aberrations and sexually ambiguous teenagers, The student president and vice-present flaunt their taste for S&M. Independent study and supplementary classes are done on homosexuality and transgenderism, and teachers and students alike leave school early because of sexually-transmitted diseases. Dasepo Girl Series features a brother with only one eye and his transgender sister, plus a poor girl literally wearing poverty on her back and her escapades into the world of sex with adults - and those are just a few of the many unique characters populating Mosseulmo ("Useless") High.
| Actor | Role |
|---|---|
 Kwak Ji-minNot listed | Not listed |
 Go Joon-heeNot listed | Not listed |
 Ahn Nae-sangNot listed | Not listed |
| YYim Sung UnNot listed | Not listed |
| CCha Jin-yeobNot listed | Not listed |
 Lim Seong-eonClass monitor | Class monitor |