The film, set in 1992, starts with a marriage ceremony of Sungeun's sister, and the high school girls envy the married couple and dreams of meeting their true love. The girls' names are Sung-eun (Kang Eunbi), Soo-yeon (
Jeon Hye-bin), who fights bullies, and Mi-sook (Park Seul-ki) and they are all disappointed about not being a popular girl like Baek-saemi, who is a celebrity. Kang Bong-goo (
Lee Ji-hoon), the new student teacher suffers from a problem where he farts when aroused. Bong-goo's friend tries to examine if that is a real problem and asks him to watch the Jean Jacque Arnot film
The Lover together, but the girls happen to be in the same theatre, that an R-rated film is being screened, to watch the movie, and Sung-eun falls in love with Bong-goo the next day in the classroom. Sung-eun and Baek-saemi compete to get Bong goo's attraction. After Baek-saemi dares Sung-eun to have sex with him, Sung-eun explores her sexuality, and tries to have sex with Bong-goo. After visiting his house, she believes she really did have sex, but realizes she did not take contraceptive measures. This leads the girls to consult with Sung-inhwa, a female student who consults in terms of sex education. Sung-inhwa is later revealed to be a person who secretly loved Soo-yeon. Also, Sung-eun realizes she cannot be pregnant yet, as she has not had her first period. After her first period, she proposes to Bong-goo again, but is soon disappointed after seeing him hanging out with Baek-saemi. This is later revealed to be him consulting with Baek-saemi about her relationship with teacher Kim-dong-soo. ==Cast==