The show began with nine main characters in its first season as the roles of Lucas Scott, Nathan Scott, Peyton Sawyer, Brooke Davis, Haley James, Dan Scott, Karen Roe, Keith Scott, and Whitey Durham. After that, characters from that first season left the show, with new main characters having been both written in and out of the series. Originally, it followed two half-brothers Lucas and Nathan Scott who started out as enemies but later formed a close bond as brothers. It also followed the brothers' various relationships with other female leads during their high-school years and in their early twenties. The series ultimately spanned nearly fifteen years across nine seasons, with various time jumps taken into account.