Park Jiyeon

- Very arrogant, the most popular girl among guy

- Loves Myungsoo very much, will do anything for him

- Hate IU out of jealousy as IU is loved by many people

-Also hate IU's best friend because he annoy her

-An orphan and was adopted by a very rich family

Lee Jieun IU

-A very kind, cute, well manner girl, the smartest student in the school, new student

-Really carefree, doesn't matter even if Jiyeon doesn't treat her well

-Have a beautiful voice that can melt every heart

-Best friend with Henry, always stop him from annoying Jiyeon too much

-Always need to help Myungsoo with his study

-Doesn't like Myungsoo's attitude

Henry Lau

-A very hipper boy, talented, popular among girl, cute

-Can rap and dance really well

-Can play most of the instrument like piano, guitar, violin, drum

-Loves to annoy Jiyeon as he doesn't like her attitute

-Best friend with IU

Kim Myungsoo

-Playboy, lazy, always skip class, hate arrogant girls, very rich

-Hate Jiyeon a lot but always uses her for homework

-Love to play guitar under the tree shade whenever he skips classes

-Never be thankful to IU for helping him with all the works that he skipped