When the school's infamous heartthrob takes notice of the 'quiet' girl.   This is a oneshot of how Hyeyi and Kai from Doubtful Relationship met. This can pretty much be a oneshot on its own, you don't have to have read Doubtful Relationship to know what's going on.  

Sequel to Doubtful Relationship Please read Doubtful Relationship before reading this :)

Doubt - "It is a poison that disintegrates friendships and breaks up pleasant relations. It is a thorn that irritates and hurts; it is a sword that kills.”