Will any plot do? I am kind of interested in the contest so I wanted to give it a shot XD I'm only writing this from the top of my head so... yeah, you can hate me for it. hehe.
One word that pops in currently in my mind is: Obsession.
A word so powerful that could take anyone down, change the way they think, change the way they act. All because of one girl. Years since they have been best friends and because of one stupid choice this guy ruins everything. Their strong friendship that he went through storms and earthquakes , you name it--gone. Finally deciding not to be in touch with him anymore, this girl, lost and depressed from the actions he has done, together with his brother finds her way of distracting herself to auditions until they both have a spot on stage.
A couple of years afterwards, the name of these siblings (the girl and her brother) rose up in popularity: albums sold out almost everywhere, guesting to tv shows. Then, there goes the concert tour where here comes one band that served as their opening act.
Of course it's her ex-best-friend. Despite of their nature growing awkward as it seems, under some scenes they had a chance to talk and made up from their past.
Here's the fun part *w* It's where this guy's feelings was still there towards her, trying to invest all his effort and love. Only that, his girl already had her feelings towards another guy and went into a relationship. The news was everywhere like a wildfire. Behind them of course was small fights and bickering that were safe from the media, but ex-bestie(Let's call him that. XD Oh god, I don't even know where I'm taking myself Lol.) knows it all.
He finds a way to stalk them, manipulate people in order to get what he wants. He just couldn't accept it! All this years of waiting for the love he wanted the most, and nothing. He makes things, hurts people and does everything so that it would seem it was her boyfriend's fault. Until her boyfriend grew scared, and suddenly disappeared.