Lu Xingzhi was surprised when he received the Sun family's photos. He realized there was a similarity between Jiang Yao and Mrs Sun when she was young.
If Jiang Yao and Sun Xiaoshan were only 70% alike, then Jiang Yao and an 18 or 19-year-old Mrs Sun looked like they were carved from the same mould.
The degree of similarity made Lu Xingzhi feel as if it might not be a coincidence. He was afraid that Jiang Yao would think too much about it, so he did not mention it to her. At that moment, he hesitated on his decision to investigate Mrs Sun.
Lu Xingzhi was afraid of the result. What if he confirmed that the similarity between Jiang Yao and a young Mrs Sun was not a coincidence? How would he face Jiang Yao?
Therefore, he did not want to continue with the investigation.