Dan, the one who's quiet, bullied, lonely.
Phil, the popular kid, the comedian, silly, outgoing.
When Dan moves to Manchester, Phil sets a goal to become his friend. But, maybe "friend" becomes an understatement.
Phil doesn't have a best friend in his life. That is, until Dan turns up at his school. They become close and Phil finds out that Dan has a twin brother, but hates to talk about him. It's not until Phil comes over to Dan's house that he finds out why.