All girls must be different. Mainly from the nature and behavior.

The Characters : 

Im Yoona ( 18 ) 

Only Ordinary Girl. Hate Men, Women sassy and infantile.
He's a smart kid, but sloppy.

Xi Lu Han ( 18 )

The Handsome Boy and Cool (?)  although he is the new kid in school but many people who knew him. 

^
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he was in love.

Kim Jong in [Kai] ( 18 )

Courtesy men. Are very fond of dogs. he was moved by her parents to Koreabecause there happened to her mental problems. He also was in love.

Sooyoung ( 18 )

good girls for Yoona. Yoona her best friend. and Yoona is very fond of her. she also already has a boyfriend. 

*Note : sorry if the language is somewhat awkward or stiff. because I can not english TT I'm very sorry. ~ ~ <3