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Explain how the tale of King Yunan and Doctor Duban relates to Shahrazad's own situation. In other words, why is this an effective story for Shahrazad to include in her attempts to change the king?
Doctor Duban is a person who did nothing wrong (same with the fisherman), yet he is being unjustly punished by King Yunan. Giving an example of a person who only does good, but receives evil back will hopefully show King Shahriyar the error of his ways and help Shahrazad prove that she is good too and should not be punished because of the mistakes of his previous wife.