Who is the nightshade in Fairy Sword 3?

During the Spring and Autumn Period and the Warring States Period, Princess Jiang Guo was the sister of Prince Longyang. In the battle with Yang, Jiang Guo was defeated, the city was breached, and the magic sword was not cast. Prince Longyang died, and Solanum nigrum jumped into the sword casting furnace and set herself on fire. This magic sword is made of her daughter's blood. The soul of Solanum nigrum has remained in the magic sword for thousands of years. After the death of Solanum nigrum, the soul was sealed by the magic sword, and Shuang Ling gave birth in the confinement all the year round. I don't know when another personality was born as a guardian. Solanum nigrum was born with blue hair and blue clothes, gentle because of less resentment, and derived from Solanum nigrum with red hair and red clothes, with sharp personality because of more resentment.