Gu Xiaonuan still harbors worries she never expected, worries for her son.
So after considering her son for so long, Gu Xiaonuan hadn't taken Qin Yue's invitation as something very important.
She has always understood Qin Yue's feelings for her brother, and because of those feelings, Qin Yue feels jealousy.
Like Gu Xiaonuan, Qin Yue is also jealous of their respective identities, but neither realizes they also envy each other's circumstances.
Currently, Chu Feige is unable to pursue her true love because her identity doesn't allow it.
But if her identity changes, then she can completely do so.
It's precisely because of the difference in identity, lacking the identity of being classmates with her brother like Qin Yue, that she has to sacrifice a lot to pursue Gu Xijue.
Gu Xijue will never agree with her, but she also refuses to just give up on Gu Xijue.
Gu Xiaonuan will not give up on any possibility; if she won't give up, she can only persist.