You (Kang Yoona) is just an ordinary student in school (TOP Academy). You are silent, and you don't have friends. Your grades are ordinary. You don't have talents. No one really talks to / with you.

It's because you're just "ordinary".

But outside school...

...you're really different.

During evening, as soon as you go home, you'll pick up your guitar and go straight to your father's bar.

You work there as a singer. Your customers enjoy watching and listening to you because of your amazing voice and talent. 

You are known there as "Mystica".

It is because of your mysterious-soothing voice...

...and it is also because you always wear shades when you are performing.

Why?

You don't want people to know the real you.

You don't want them to know that you are Kang Yoona.

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Ahn Daniel (Niel) is the team captain of the soccer varsity in your school. All girls fall for him easily because of his looks and his greatness in soccer. 

Lee Byunghun (L.Joe) is a gang captain. Girls love him because he is a kingka. People in your school are scared of him because of his bad image.

Lee Chanhee (Chunji) is the student council president and the Chess Club president of your school. He is really responsible, and girls fall for him easily because of his looks and intelligence. 

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What will happen if these three guys will know your deepest darkest secret?

And what will happen if they fall in love with you?