That confirmed she was indeed his and Zhou Li's child.
However, he did not reveal this truth; he just silently looked after her after Lin Xinxin entered the Zhang family.
He also dared not reveal the truth because Mrs. Zhang was not someone to be trifed with.
If she had known about Lin Xinxin's existence, she would certainly not have let her go.
Moreover, he didn't want to expose the scandal, nor did he want another child to divide the property. Having just Zhang Yingying as his child was enough.
Who would have known that later on, Zhang Yingying died!
In the years following Zhang Yingying's death, he was even less able to acknowledge Lin Xinxin, as Mrs. Zhang, grieving over her daughter, would be even less likely to spare Lin Xinxin.
Furthermore, since Lin Xinxin's abilities were not sufficient, he also wanted to temper her for a few more years until she was capable enough, also waiting until his wife was not so heartbroken, then he planned to find a time to acknowledge her.