Song Na Ra. Her life is boring as ever. At least that is what her twin sister keep saying to her. And..yes, she has to admit to her boring life. No girlie bestfriends, no hangouts and no boyfriend EVER. She is almost 21 years old and she never leaves the house except for school. She is only intrested in books, anime and kpop idols in her entire life. All she can say about her life is BORING. But she loves her life. She never finds it is wrong to have a peaceful life as hers. Only her twin sister is the one who always tell or begging her to live as normal as others. 

She is now attending the most prestigious university in Seoul with her lovely twin sister but her life is still the same. Different story about her twin sister, Song Ha Na. Song Ha Na was known as the most beautiful and popular girl in their previous high school and NOW. Yes, currently Song Ha Na is once again become the most famous as a beautiful girl and of course popular among guys a LOT. 

One day, her boring and calm life suddenly turns upside down due to her lovable twin sister Song Ha Na. She is dragged along to the university summer trip with a bunch of people and..guys which she never imagined before. During the trip, she gets to know someone..special. Kim Myungsoo. The most charming, cool, popular and sweet person she ever meet. 

So, how a boring and nerdy Song Na Ra handle this kind of situation? Did she finally fall in love for the first time in her life? Or is it just a normal vacation trip?