Maturity...
Gu Tiancheng was very strict with his daughter; he sincerely hoped his girl could be more mature and get along well with Li Yan, yet things didn't go as he wished. Instead, she just bullied the honest and straightforward Li Yan, not understanding his good intentions at all.
"Even if I told you, you wouldn't get it. Your Qiu Xue has been obedient since she was a kid, doing whatever you say. How could you understand me?"
Whenever mentioning Qiu ZhenDa's daughter, gentle and graceful, always smiling and speaking softly, Gu Tiancheng felt immense jealousy. They were both girls, so why was there such a difference in their personalities?
"Qiu Xue's personality makes her easy to be bullied, but Gu Tong is different. I wish she would learn from Gu Tong. I could at least feel a bit more at ease."
Perhaps this is the mindset of being a parent, always worrying about your own child while seeing only the good in others'.