No blood relationship, just friends, just grew up together. Qian Hao's mother is Yu Zhong, and Yu Zhong's mother worked as a nanny in Feifei's house when she was a child. They grew up together. Yu Zhong was jealous of her and pushed her down the hill. Later, she went down the mountain to look for him, but she didn't save her, resulting in her brain being only 10 years old.