Regarding the matter between Du Huang, Tang Xiaoquan didn't pursue it any further, nor did he even ask. The reason was simple:
He's not someone who indulges in gossip;
Moreover, if Huang Yaru was indeed as he expected, having had something happen with Du Jian, the result would be something he was happy to see.
After all, compared to Wang Qiang, Tang Xiaoquan would rather see the vixen seduce Du Jian.
Because if that were the case, he would have the opportunity to be rid of this annoying woman, since they would eventually separate from Du Jian, and Huang Yaru following Du Jian would naturally go along with him.
So Tang Xiaoquan would not only not interfere in their relationship, but would actively try to facilitate it.
Unfortunately, things don't always go as one wishes. Perhaps Du Jian's jinxing words were coming true; Huang Yaru's cough worsened over time, truly seeming like a cold.
So she simply went to bed to sleep later on.