New high-school transfer student Na-Mi comes from a small town in Jeolla Province to her new school in the capital city of Seoul. When she is nervous, her small town dialect comes out & she starts to shake. On her first day at her new school she is bullied by others. Coming to her help is a group of girls. The girls are Choon-Hwa - known for her strong sense of loyalty & excellent fighting skills, heavyset Jang-Mi - who badly wishes to have plastic surgery to get double eye-lids, Jin-Hee - excellent when it comes to spewing profanity, Geum-Ok - interested in literature, Bok-Hee - dreams of one day becoming Ms. Korea and Su-Ji - always arrogant. Na-Mi quickly becomes part of their group. When the group confronts rival girls known as Sonyeo Sidae ("Girls Generation"), Na-Mi spews curse words she picked up from her grandmother. Because of Na-Mi the girls are able to avoid a crisis. These seven girls then form their own group named "Sunny". They also vow to stay together forever...