Kathryn Zestin was Calum Hood's best friend in elementary school when she had moved to Australia with her parents when she was 4. First day of kindergarten, they had met but weren't friends. Year 5, they became best friends because of a little incident. They had been best friends ever since until Calum and his mates (Luke, Ash and Michael) started a band and toured with one direction. They never talked since the 1D tour and other than those 4 boys, she had nobody to hang out with. So she moved back to Canada where she was born, by herself, and just finished high school there. She was only 16 when she moved and lived alone already. She makes friends in Canada; Hannah Marlo and Kaylee Deni. They became her best friends and she forgot about Calum and the band. But she would still always listen to their music, since it was them playing and it made her feel like they were with her still.