Su Qingsang wanted the answer, not because she didn't like Xiang Caiping, or because she wanted to rebuild the mother-daughter relationship with her real mother.
After meeting Xiang Caiping, she realized something.
Xiang Caiping had suffered for twenty lonely years. That made Su Qingsang wonder if her real mother lived an even worse life than Xiang Caiping had.
Xiang Caiping sold her apartment and left for the North to start her own business. She was a strong, capable woman. Still, she missed her daughter so much.
What about the other woman, the woman who gave birth to Su Qingsang?
Was she living an unfortunate life in someplace that Su Qingsang didn't know about? Was she unhappy?
Su Qingsang didn't want to think about that, but she couldn't help it.