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The Perfectionists is a spin-off of the American teen drama television series Pretty Little Liars. It is based on the book series of the same name by Sara Shepard, which is a sequel to the Pretty Little Liars book series. The Perfectionists was developed by I. Marlene King and produced by Alloy Entertainment, Longhorn Television, and Warner Bros. Television. The series premiered on Freeform on March 20, 2018.