Chapter 1247: He Is the Most Deeply Buried Enemy
Nan Gong didn't know about Old Master Nan's situation. He couldn't let Nan Ming "mistakenly believe" that Old Master Nan abandoned his mother after starting a relationship. So the only remaining path is through his mother's relatives.
On that side, Nan Ming's mother's elder relatives are old and probably wouldn't risk themselves to earn credit, so it would have to be someone of the same generation.
Among Nan Ming's mother's peers, the women are focused on family, so only the men remain. The relative Nan Ming would be closest to, Mengyu guesses, should be Nan Ming's mother's uncle.
Gan Hua wants to expose a secret that should be related to Nan Ming's uncle.
However, Gan Hua and Nan Ming only have a relationship of mutual exploitation. If it's truly a precious secret, how could Nan Ming tell Gan Hua?
