Why is Yang a person? Didn't grandma say that Yang wouldn't be the woman in the Lanling Heroes? Isn't Zheng Fei the only one in the life of Master Lan Ling?

Empress Dowager Cixi said that in ancient times, people lived in the land of Zheng, and the goddess was a descendant of Wu Xian and was given the surname "Zheng". Her grandmother should have figured it out. Yang Shenglai's mission was to protect the warrior Lan Ling, and even she would lose her life because of it, so she couldn't bear the death of her granddaughter, so she lied to her. Maybe she figured it out, but she didn't. .