The "After Series" is a collection of romance novels written by Anna Todd. The series began as fan fiction inspired by the band One Direction and follows the tumultuous relationship between two main characters, Tessa Young and Hardin Scott. The story explores themes of love, heartbreak, and personal growth as the characters navigate their complex emotions and challenges. The series consists of five main books: "After," "After We Collided," "After We Fell," "After Ever Happy," and "Before." It gained significant popularity, leading to film adaptations that further expanded its audience. The books are known for their intense drama and character development, appealing to young adult readers.