How would Bryon and Mark both be considered protagonists in the novel That Was Then, This Is Now by S.E. Hinton?

In literature, a protagonist is the main character of the novel. Bryon and Mark could both be considered protagonists in the novel That Was Then, This Is Now because they are both the central characters in the story. Bryon is the dynamic main character who gains perspective and changes his outlook on life as the novel progresses. Mark is Bryon’s best friend who disregards authority throughout the novel and engages in criminal behavior. The story revolves around Bryon and Mark’s relationship, which makes them both main characters. Both Bryon and Mark’s behaviors, personality, and lives are examined, and their relationship changes as they grow distant from one another. Bryon develops a sense of empathy and perspective, while Mark remains selfish and defiant. Their differing personalities and directions in life take a toll on their friendship. Eventually, Bryon calls the police on Mark and their relationship is negatively affected.