Why doesn't Lang Xianping seem to be famous in Hongkong?

I think this can be answered from Professor Lang's previous conversation. He said that Hong Kong students generally pay more attention to personal problems, like to work hard, and rarely pay attention to national issues. This is also because many local students in Hong Kong rarely go into politics after graduation, but engage in industries such as finance. On the other hand, in contrast, mainland students have more feelings for their home country, and they all like to pay attention to national affairs. They have ideals and ambitions for reality, but they are not down-to-earth like Hong Kong students and only care about things around them. This should answer your question, and it also shows that there are few internationally renowned professors in Chinese mainland University, unlike the Chinese University of Hong Kong. If you ask those students in the financial field, they probably know Professor Lang's name.