What has the author Si Daye written?

It seems you're asking about an author named "Si Daye". However, there is no widely recognized author with that name. It's possible you have a typo or a misunderstanding.

Could you please double-check the spelling of the author's name or provide more context? Perhaps you meant a different author with a similar name, or you're thinking of a specific work that might be attributed to this author.

With more information, I can help you find what you're looking for!