Before 21-year-old twins Railey and Seazynn Gilliland were cast as real-life indie-pop sister duo Tegan and Sara Quin in Amazon Freevee’s “High School,” they were working at Round Table Pizza in Fresno, Calif., and making goofy TikToks on the side. Neither really knew about the Grammy-nominated band —except when their growing TikTok fan base would point out their resemblance.

“We had heard the names ‘Tegan and Sara’ because people in my comments section would compare us,” Railey tells Variety on a gray day at a park in the Mount Washington neighborhood of Los Angeles. “But we never really looked into them.”

Then, Railey got a Dm from Tegan, who had stumbled on her TikTok account. Tegan explained that she and Sara were adapting their bestselling memoir “High School” — which chronicles their teenage discovery of their passion for music — into a TV show, and were looking for identical twins to audition.