Kim Kyu Na,a 24 yrs old,brave and active girl whose having Kyuhyun and Ryeowook as her coursemates.At first,she was excited to have them as her coursemates because they are the members of the most popular boy band at their college that is Super Junior but now she swore she regretted for knowing Kyuhyun,The Evil Magnae.Also close to Eun Hyuk,her kind Sunbae.A fan of Lee Donghae, that plays soccer just the way she likes.

Lee Donghae,a 26 yrs old guy,that sings and also busy playing soccer for their college.Being the Mystery Guy in TalkToMe,a famous website made by him specially made to chat.Slowly starts liking Kyu Na.

Cho Kyuhyun,a 24 yrs old guy who really enjoys to irritate Kyu Na.He fell for Kyu Na ever since the first time he sets his eyes on Kyu Na.But  didn't realize that he likes Kyu Na until the very last moment.

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This story gets interesting when Kyu Na starts to chat with the Mystery Guy and shared her secret that she likes Lee Donghae.While on the other side,Donghae discovered that the girl he chatted with is Kyu Na and end up liking her.Slowly he's giving some hints to Kyu Na to let her know that the Mystery Guy is him.But what about Kyuhyun?He's been liking Kyu Na way before Donghae did.Will Kyuhyun confess to Kyu Na?Will Kyu Na likes Kyuhyun back?Who will be the one that sacrifices their love?