Flame of Revenge

The Wind Kingdom had little to no contact to the Sky Kingdom for ages. Only in the past decade do they trade through the seas and the Wind Kingdom had no interest in their politics or kingdom.

The Sky Kingdom has entirely different cultures and traditions which were not accepted by the three kingdoms. The Sky Kingdom valued monogamy as an important virtue but the three kingdoms and the fire kingdom followed polygamy. Their beauty standards were also different that fair skinned women were considered beauties in their kingdom and the people in the Sky Kingdom are of varied skin tones and so for them complexion didn't matter. The sky Kingdom also had very fertile lands and gold... They had a lot of gold!

Xing learned about the Sky Kingdom's cultures back in the Heavenly Flowers Palace where there were two courtesans from the Sky Kingdom. She learned to speak their language from them too and since they didn't know how to read or write, she couldn't learn that.