Sister Weng could only stay guarded all the way. If Mother Lv pursued relentlessly, ultimately, she'd have to turn the tables. Let's just say Mother Lv went too far this time, wanting to publicize she was carrying a monster, causing Sister Weng to be unable to tolerate it in any case. This can be inferred from the Lv Family discovering later she had been plotting for a long time.
From this, it's evident that the biggest loser in the whole affair is Mother Lv. Mother Lv plotted to have her son find another woman to continue the family line and give birth to a son, believing Sister Weng incapable of bearing a son and wanting to cast Sister Weng aside. If, in the end, she discovers the truth is that it's really her son who can't, it would be earth-shattering.
Mr. Lv truly kept it from his own mother, but why? A mother to a son is a very special female figure. A son feels more ashamed facing his mother in this aspect than even facing his own wife.
