Kim Taeyeon (18) -pretty,cold,rich,queenka and popular. she was a dorky and friendly girl back then she was loved by many because of her kind attitude but that changed. she wasn't the Taeyeon everyone knew, she wasn't the dorky and friendly girl anymore. she's now a bad girl. everyone in the school respects her and her friends because if they dont theyre dead. she hates Byun Baekhyun so much. she turned into a bad girl because she wants revenge. 

"Don't mess with me if you dont want to die." - Taeyeon

Girls Generation/SNSD (18,17,16) - pretty,rich,cold,queenkas and popular. they were also dorky and friendly back then but now theyre bad girls that wants revenge. nobody dares to mess with them. Taeyeon's bestfriends for 13 years. 

Jessica Jung 18

Sunny Lee 18

Tiffany Hwang 18

Hyoyeon Kim 18

Yuri Kwon 18

Sooyoung Choi 17

Yoona Im 17

Joohyun Seo 16

"You mess with one of us, You mess with all of us." -SNSD

BTS/Bangtan Boys -handsome,dorky and popular boys. likes Taeyeon. They heard that Taeyeon was a bubbly girl back then so they want to bring the old Taeyeon back. 

Super Junior - handsome,popular,rich,dorky,kind and kingkas. SNSD's bestfriends. they want the old SNSD back.

Kim Heechul -Taeyeon's brother

Choi Siwon - Sooyoung's brother

SUPERGENERATION pairings

Jessica Donghae

Sunny Henry

Tiffany Nickhun

Hyoyeon Eunhyuk

Yuri Siwon

Sooyoung Kyungho

Yoona Seunggi

Seohyun Kyuhyun

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sorry!! Im not that good in english! ^_^