Rumors have been circulating the net for months now that she had been cast as Cho, but no confirmation could be found. Recently, "Seventeen Indonesia" magazine printed something like this:

"It happened when BoA visited London to sing with internationally famous boyband, Westlife, for their newest album, "Unbreakable: The Greatest Hits". In London, she got a request to play as Cho Chang in "Harry Potter and the Prisoner of Azkaban".

That's all we have for now, stay tuned.