They really simplified the issue with Queen Whilmena and her husband Duke Henry. It was then just the heir that was an issue. Another issue was that Duke Henry was a womanizer who had frequent affairs. A child briefly fixed their relationship but Duke Henry continued his womanizing.
Fun fact/ sad fact the Joseon Dynasty did have a royal dog breed it was the Sapsali. It nearly went extinct in this time period due the Japanese culling it for its fur. It was believed to be guardian that scared off evil spirits.