What is the theme of "The Concubine"?
The central theme of the story is man's potential to manipulate his or her own destiny versus the decree of the mystical cosmos employed through folklore, tradition, and superstition.
This is a story wrapped around a simple scenario: A young widow, trying to make it, a man interested in marrying her, and the tragic circumstances she still experiences emotionally due to the tragic death of her husband. This is quite ok. Yet, when you include all those thematic elements expressed in the first paragraph is when the story takes a completely different tone and shade, and will become more complex.