The two girls had been calling Dong Xinxin's brother 'Lijia'. So, Lin Wenwen figured that her brother was named Dong Lijia. Based on what Dong Lijia said to the two girls, she guessed that Dong Xinxin liked the two girls very much.
Clearly, Dong Xinxin was either unsophisticated or silly. Judging by the clothes that she was wearing, Lin Wenwen could guess where Dong Xinxin's IQ was set.
The two girls coaxed her into purchasing the clothes that she was wearing while her brother wasn't with her. Just now, Dong Lijia took her to a shopping mall and bought her some other clothes because he found what she wore not suitable for her.
Great! Her brother was not only handsome, but also rich!
Dong Xinxin the girl didn't seem to be in lack of money either, because she had quite a few secondary credit cards in her wallet!