Why is the blue-eyed fox corpse in the Wang family?

The Wang family followed Wu Sansheng into the Qixing Lu Palace in their early years.

According to a query on Douban.com, the TV series "Sand Sea" is directed by Mao Kunyu, starring Wu Lei, Qin Hao, and Zhang Meng. It tells the story of Li Cu, an ordinary high school student who is involved in a world based on the current situation of the world. In the ambitious plan, we get to know the story of Wu Xie, the behind-the-scenes planner who appears as a travel photographer Sekine. The drama premiered on July 20, 2018.