The series features variou schools with huge impact in the series. They normally define characters groups, as they move within the "circle".
=== Schools on Dokgo Rewind
===
GEE CHUN HIGH
DANG YOUNG HIGH
YU RIM INFO TECH HIGH
BAE SUNG ALL-GIRLS HIGH
DAE TEE HIGH
DONG JIN HIGH
HAN CHANG TECH HIGH
DAE SHIN TECH HIGH