Main Characters :

Tiffany:  Rich girl, stubborn at first and rejects Taeyeon's proposal but then falls inlove with her eventually. She is part of the mean girls at school along with Jessica, Hara, Jiyeon and Sohee. Makes guys fall for her eyesmile (even girls).

TaeYeon: Average class girl. Kind and dorky, she has her famous "Ahjumma Laugh". Has hidden feelings for  Tiffany but got dumped after she confessed yet she doesn't give up her love. Friends with Yuri, Junhyung, Joon, JaeJoong, Yoona, Seohyun, Sunny, Sooyoung, Hyoyeon and Eunhyuk.

Yuri: Sporty, the iest girl in their group, good at swimming. Likes Jessica but like Taeyeon, she got dumped after confessing her feelings. At first she gave up but she realized she can't move on.

Jessica: Ice Princess, because of her scary death glare. She is part of the mean girls in school. She dumped Yuri and regretted it. She realized she fell inlove with Yuri because of her annoyingness.

Supporting Characters: 

Mean Girls:

Goo Hara, Park Jiyeon, Ahn Sohee

TaeYeon's gangmates:

Yong Junhyung, Lee Joon, Kim JaeJoong, Im Yoona, Seohyun, Lee Sunny, Choi Sooyoung, Kim Hyoyeon and Lee Eunhyuk.