Hey Buddy!
Just finished re-reading your story, and I'm thinking that Mystery Girl is Su Li, considering all the other major players in the working group had a moment in the sun this chapter, but she didnt. Also, the way that the Patriarch of the family referred to her mother's heritage, and the, quite frankly, rude way he referred to her mother's way of getting a young man's interest, I would suspect that the mother is of oriental asian background. I'm basing that on my own experience in Korea, so I may be way off base.
red