sentences:  Schwahn served as executive producer while also writing and directing for the show, including the premieres and finales of all seasons.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.