Keep That in Your Head

8 girls, one teacher. 8 girls are in high school, for all their lives, they were known as the scary friend group; constantly bullying students and even teachers. They had tried to find love but it never works, they have gotten into 4 failed relationships. But... The group then fell inlove with their teacher, Yoo Jeongyeon. Jeongyeon is 24, while her students, three are 17, two 16, and the rest; 15. Nayeon is stuck in a conservative family. All her life, people would always tell her; "Keep That in Your Head", Momo, Sana, and Mina are triplets stuck in a neglected and abusive family, Jihyo is in a solo apartment on her own without her parents, her parents are always busy in work and business trips, while Dahyun, Chaeyoung, and Tzuyu all have manipulative family.