Wooin's little sister Y/n was one of the tops of Sunny High which her brother Wooin proud of, but there's something strange his little sister is hiding Y/n is also the genius Vice President of Sunny High and Dom Kang's childhood friend, everyone see her as a nerdy girl who's always on her book and anime but how will her classmates react if they saw the real her? When she heard about his brother Wooin joining the league of street with her long time crush she immediately made her mind to join the biking club