More importantly, Gu Yu had a good personal relationship with Zhou Mingfei! In the past, every time Zhou Mingfei came to Jingdu, he would meet up with Gu Yu. Zhou Mingfei had a good relationship with many of the children of Jingdu's big families, and he was the closest to Gu Yu!
Because Zhou Mingfei did not like Shao Ying, he got close to Gu Yu. According to what Jiang Tong knew, Zhou Mingfei even complained about some family matters to Gu Yu in private after Zhou Jingyun rejected the marriage. Of course, he would not tell her about the bet, but he did mention that he wanted to help his elder brother, but he was powerless. His father and the old master of the Zhou family were very stubborn and wanted to continue forcing Zhou Jingyun to agree to the marriage. Regarding this, as an outsider, Gu Yu could not say anything. She could only pat Zhou Mingfei's shoulder to comfort him.
Therefore, Jiang Tong thought that Gu Yu probably knew about her.