Who are the characters of story Best-Seller by o Henry?

"Best-Seller" is not a known short story by O. Henry. It's possible you're thinking of a different story or that the title is slightly misremembered.

To help you, could you please provide:

* Any other details about the story: Do you remember anything else about the plot or characters?

* The publication date or anthology: If you remember when or where you read this story, that might help narrow down the search.

Once I have more information, I can try to identify the story and its characters for you.