On their way back, Zhao Yi and Sun Liang seriously discussed a biological question and ultimately arrived at two conclusions.
First, Niu Lianhua's family genes were not bad at all, with Zhao Linlin being a clear testament to that fact, they had met Zhao Linlin's other relatives, and their appearances and attractiveness were quite impressive too.
In fact, Niu Lianhua herself didn't look bad either, the reason she seemed somewhat frightening was mainly because of her large build and the aura of someone with deep-seated grievances, along with her messy, ungroomed hairstyle, not to mention her incredibly ugly glasses.
In short, there were many factors.
All these added together could overwhelm the slight advantage of good looks.
As for Xue Pinggui, it was purely an issue with his genes.
The conclusion that Zhao Yi and Sun Liang reached was that Xue Pinggui's family genes were passed on to the males but not the females; having fathered two lovely daughters explained it all.