Since I haven't read the novel, it's hard to say exactly. However, based on the title, the main characters are likely to be best friends. They could be ordinary people living in a small town, with different personalities. One might be more outgoing and adventurous while the other is shy and reserved. Or perhaps they are students in a school, dealing with school - related problems like exams, bullies, and popularity contests together as friends.
Not having read the book, I can only guess. The main characters could be friends who have known each other for a long time. Maybe one of them is a bit of a troublemaker and the other is the more level - headed one. They could be from different backgrounds, like one from a wealthy family and the other from a more modest one. Their differences and similarities would likely play a big part in the story as they navigate their friendship.
I'm not sure as I haven't read the book, but they could be two girls or two boys, or a mixed - gender group of friends.