The best friend rule: never ever fall in love with your best friend. Unfortunately, that was the biggest rule that Chanyeol ever broke. Forewordtitle: Just Friendspairing: BaekhyunxChanyeol || other pairings will be mentioned as the story progressessummary: The best friend rule: never ever fall in love with your best friend. Unfortunately, that was the biggest rule that Chanyeol ever broke. warning: unbetadnote: read the note after reading the whole story.