South Market?
There aren't many shops in South Market, but there are more residences. Most of the wealthy families live there, as Su Yunjin seemed to recall Gu Ya mentioning.
He said that Wu Xinxin's family home was also in South Market. Hongyun Building is the Wu Family's restaurant, yet the Wu Family's residence isn't on this street—it's in South Market where Wu Xinxin's home is.
The more Su Ningxiu spoke, the more Su Yunjin felt that the man surnamed Wu must be related to Wu Xinxin's family. Besides, the fact that the other man didn't specify where his home was to her second sister Su Ningxiu was certainly fishy. Her sister Su Ningxiu might be gullible, but Su Yunjin was not so easily fooled.
Once Gu Ya returned, Su Yunjin planned to ask him to help her inquire about the man surnamed Wu to see which family in town he truly belonged to,
and whether he really was connected to Wu Xinxin's family.