(NEWSER) – When Alan Rickman started playing Professor Severus Snape, the end of the Harry Potterseries was not yet written—but JK Rowling already had Snape's story arc figured out, and she hinted to Rickman that (spoiler alert!) there was more to Snape than met the eye so that he'd understand the character's motivation and know how to play him.

Rickman had hinted at that fact in interviews, Mashable reports, but he never revealed exactly what Rowling told him—but now Rowling finally has, thanks to a fan on Twitter who asked her, "Will you tell us the piece of information that you told Alan Rickman about Severus Snape? Or will that forever be a secret?"

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