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Being a SPY isn't an easy task. 

What if Krystal (YOU) will watch over a stranger (A Man: Sehun) just because someone told you to do it?

Are you willing to collect some information, evidence, movements, activities & etc.?

What if you fell in love with him just following him around? 

Are you willing to take the risk?

The risk of..... FALLING IN LOVE?

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