Who can answer that Cantonese has something to do with Hakka?

Vernacular, vernacular and Cantonese are just different. Country people call it vernacular.

There is a saying called Guangdong and Guangxi.

No one is more authentic in Cantonese. After historical development, pronunciation has changed to a certain extent.

At present, there are a full set of voiced initials in Cantonese in Wuzhou, Guangxi, which are the living fossils of "Yayan" in Qin and Han Dynasties. However, Guangzhou dialect does not have these voiced initials, but more are Tang Yin and Song Yun. Cantonese and Hakka have the same origin and are brothers. When Cantonese spread eastward from Guangxin (now Wuzhou, Guangxi), it was relatively stable and no longer accepted the further assimilation of Chinese in the Central Plains, which was manifested in its attitude towards Hakka dialect. Hakkas entered Lingnan from the Central Plains, and reached a climax when they crossed south with Song Gaozong in the late Tang Dynasty. At that time, the original Han immigrants in Lingnan were very powerful and controlled the economically developed areas such as the Pearl River Delta and the plains on both sides of the Xijiang River. Therefore, the newly moved Hakkas can only settle in Lingnan Mountain area. Originally, Hakka dialect was regarded as a relatively standard Chinese in the Central Plains at that time, but it was unable to assimilate Cantonese, which had formed its own characteristics, after it was introduced into Lingnan. On the contrary, according to the principle of "poor learning and rich learning" in cultural exchange, Hakka dialect in some areas has been infiltrated by Cantonese and become a "cross-strait language".

In short, the vernacular is the living fossil of elegance in Qin and Han Dynasties, Guangzhou dialect is the living fossil of elegance in Tang and Song Dynasties, and Hakka dialect is the living fossil of the combination of Central Plains and Lingnan culture in Tang and Song Dynasties.