What is the relationship between Guangfeng dialect and Japanese? What is the origin of dialect and Japanese as a beautiful film of Wu language? What words and expressions have influenced it?

Many languages in Wu dialect and Japanese syllables have obvious monosyllabic characteristics. The tone sandhi of Wu dialect makes it sound less ups and downs than most other Chinese, similar to Japanese with relatively flat overall tone. I think these two points are the main reasons why Wu language and Japanese language are similar in hearing sense.

Of course, in history, Wu language has something to do with Japanese. In Japanese, the pronunciation of many Chinese characters comes from the "five tones" in China's Southern and Northern Dynasties, but this is not the reason why they have similar feelings. After all, the main component of Japanese language stream (especially spoken and written language, which may have more phonetic words in Chinese) is harmony words, and the scattered phonetic words of Wu are not enough to make it sound and feel close to Chinese as a whole.

In fact, I don't think anyone who has really touched Japanese and at least one Wu language will feel how similar the two languages are.

I think, in terms of pronunciation, the difference between Wu and Japanese is just like the difference between French and Italian.