The Perfectionists: All the New and Returning Cast Members of the Pretty Little Liars Spinoff

Parrish will be reuniting with Pieterse and reprising her role as Mona Vanderwaal. However, instead of being the social climber that she once was, she's now working as a counselor at the school. "She moves to Beacon Heights to try to reinvent herself and start from scratch," Parrish told Teen Vogue. "But ultimately, she's still Mona. Darkness still follows her. She's still mysterious."