After Daiyu died, she discovered that she was actually a fairy grass, and that she had an older brother who was named the Buddha of Fighting and Victory, and... The person who had protected her for thousands of years.
The Bodhisattva said that cause and effect reincarnate and you are reborn in one life. In addition to settling the grievances of the past life, Daiyu also needs to continue to practice. She is just a fairy grass, but she inherited the ancient bloodline by chance.