Sandara Park :

                She is one of the most popular girl in SMU.  She is very intelligent , sweet , kind and simple girl. She is so simple  with the way she dress and  nobody will think that she is the daughter of the Business tycoon Park Minho. Female students love her and male students respect and admire her for that. Though she is only 17 she has a lot of suitors but only Kwon Jiyong captures her heart. 

Kim Jaejoong

                The most handsome student in YGU, he is also known as the King . He is a good singer  and player of YGU soccer team. He loves his girlfriend (Yoona) so much , that he can’t see the bad things about her. He believes  in everything that she say , for him she is the most loving girl in YGU.

Kwon Jiyong:

                He is a heartthrob  in  SMU, he is  a very talented student. He is good in music , dancing as well as in sports. He is an ace player  of the soccer team of SMU.  He had a  lot of female fans , but he courted Dara  the woman who caught his attention because of her simplicity and  intelligence.

Yoona

                The Queen of YGU , she is the most beautiful student in the university which makes her boastful and mean to other students. Her beauty is only on physical , because inside her is a cold hearted  mean girl.  She wants the attentions of male students, she wants them to see  following her .  She is the girlfriend of Jaejoong the  King of YGU.

Sandara is very happy with her relationship with Jiyong  , she thought that they will stay like that forever. She believes that they belong to each other, and that they are destined to  be together.  But all of her dreams shuttered  when she learned that Jiyong is seeing someone from YGU.  She caught him  kissing another woman which lead them to a break up.  Then the following semester Jiyong transferred to YGU  to follow Yoona  the woman who stole Jiyong.

Dara  was never the same  again after they broke up, she is always sad and always go home after class. The students of SMU saw the changes in the most friendly student ,  her parents and sisters are also worried for her . Then one day her sister Gummy gave her an advice which lead her to  YGU to take her revenge to Yoona.

“ We are the daughters of Park Minho, so stop sulking  Dara . We don’t cry  if someone hurt us , we GET EVEN. If someone hurt you let them feel the hurt and pain they cause you. “ Gummy said.