It is written in the biography that Su Daji was possessed by a nine-tailed fox demon. The reason why she wanted to hunt down Jiang Ziya was because her tenth tail was cut off by him and she lost a lot of mana. The tail was missing somewhere. Su Da tried to look for it but could not find any trace of it.
The tail was picked up by a noble son and soaked in the family's spiritual lake. Thousands of years were enough for the tail to give birth to a new body. She goes in and out of the mortal world and has to clear up the cause and effect of her past and present lives before she can shed her demonic body and pursue the path of immortality.
Purpose: Ancient Chinese novels