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HWANG HYUNJIN as... GROW UP
The ace of Yeji's rival dance team, and popular pretty boy with a lot more talent than she likes to give him credit for. There's something about him that rubs Yeji the wrong way, and she's determined to show him that she's not the stereotypical nerd he seems to think she is (and that she can beat him at his own game).
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HAN JISUNG as... SUNSHINE
Sohee's annoying childhood enemy that her mother seems hellbent on making her befriend. Their petty feud started long before they even got to high school, but the rivalry between their schools has only fuelled it further. It's probably best not to leave them unsupervised in case one of them ends up dead.
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LEE FELIX as... BOXER
The only exchange student among the boys, Blodwyn thought that could be a bonding experience. Until the freckled boy tried to insult her, and she realised he was just as bad as the others. Except hatred isn't in her nature, and it's physically impossible for her to stay mad at people for long periods of time, even people like Felix.
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KIM SEUNGMIN as... YOUNG WINGS
Juyeon's co-worker at the theme park who she totally did not have a crush on before finding out he went to her rival school. So now she has to hate him on principle. And honestly, Juyeon thinks that would be a lot easier if he wasn't so nice to her, and attractive, and smart, and ... well, you get the idea.
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YANG JEONGIN as... ASTRONAUT
The new found friend that Sol didn't go looking for, nor did she think she needed, especially since she's not known for socialising outside of her very small friend group. Yet he's somehow managed to weasel himself into her heart, and for someone who attends the Gangnam Institute, Sol supposes he's not too bad company.
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CHOI SOOBIN as... RUN AWAY
Ahreum's next door neighbour who is probably one of the kindest people on the planet. Ahreum thinks the boy might actually be epitome of perfect, if not for the fact that he attends the Gangnam Institute, and somehow manages to act friendly towards her brother a.k.a The Devil Incarnate.
