What if you woke up in the middle of the night just to found out that you are a princess?

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Jung Soojung lived peacefully for the past 17 years. Even though she lived alone with her sister without knowing about her parents, she didn't mind. 
But what if some stranger come to her and said that she's the long lost princess?
What if her classmate, her ultimate enemy, her boy who lived, Kang Seungyoon, come to help her and be her bodyguard?
Can she survive?