Based on the Chinese 2010 movie (which is, in turn, based on a book by a white author, IIRC).
Oh, forgot to say, IMDB & Wikipedia gave conflicting information: IMDB credited Robert van Gulik for the original story, but Wikipedia said that the movie is based on Lin Qianyu's Detective Dee and the Mystery of the Phantom Flame. Most of the articles about the film only mentioned that it's based on historical figure Dí Rénjié so it's hard to verify which is true.
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Oh, forgot to say, IMDB & Wikipedia gave conflicting information: IMDB credited Robert van Gulik for the original story, but Wikipedia said that the movie is based on Lin Qianyu's Detective Dee and the Mystery of the Phantom Flame. Most of the articles about the film only mentioned that it's based on historical figure Dí Rénjié so it's hard to verify which is true.