Question : Why Ping's mother treats Ping cruelly. Is she really a cruel person? Or is it something that leads her to act that ways?
From my opinion, Ping's mother treats Ping cruelly because she's really a cruel person. She's not a good mother. This is because she always treat her daughter badly. I think Ping's mother had been through bad memories during her childhood where she was treated badly by Ping's grandmother. And by looking at the way Ping's grandmother care about Ping, her mother feels irritated that makes her want to prove her mother that she can be a good mother to Ping. So, we can see that Ping's mother is a cruel person. Maybe because Ping is not her biological son.
