I'd have to disagree with Gyeongsang dialect and Japanese language relation. They are two totally different languages, sure it may sound similar, but they're still different. The Japanese language was more influenced by the extinct Korean peninsula languages, more specifically the one connected with Goguryeo. There's no doubt there have been influences from the Ryukyuans and Ainu as well.
I think most Japanese researchers realize a large proportion of Japanese have their origins at the Korean peninsula. The relative age of haplogroup O2b1a is younger than haplogroup O2b* and O2b1*. But I also don't support those ultra-nationalists in Korea saying Japanese are basically the product of Koreans inter-marrying with the natives. Koreans have also been largely influenced by Japanese culture. Nor do I support those Japanese right-wingers saying that they have absolutely no relations with Koreans.
Can you speak Gyeongsang saturi? if you don't then you can't argue with Gyeonsang saturi, btw it's saturi not dialect.
Modern Korean language don't have dialects like China or India, but regions kept their own saturi or slang & accents.
Gyeongsang accent and saturi is most closest to Japonic language in terms of accent & sound, btw way I was referring to sound, dialect & accent are associated with sounds. I wasn't referring to writing.
Of course modern Korean language is completely different from modern Japanese.
The main reason why a lot of people don't link Gyeongsang saturi & accent to Japanese because both Koreans and Japanese nationalists don't want to associate each other with deep connection. Before Silla and Baekje, there were three tribes called Samhan, each Samhan had different language & customs. One of these extinct tribe were closely linked with Japonic culture & language and archaeological evidence rove this.
Also, Silla's house that still survived today is most closest to ancient Japanese house, houses in Goguryeo and Baekje were very different from Japanese. More over, some of Silla's expats and royals came from Japan as well. This clearly show they were most closely linked people.
I disagreed with you in terms of Japanese language connection with Goguryeo language.
Japanese shared no cultural and genetic relationship with Tungusic-Koreans in the North of Korean peninsula.
The only possible explanation is Baekje, which also came from Goguryeo line and influenced Japan. Majority of original founder & settlers of Baekje was royal blood of Goguryeo and Buyeo people.
Ryukuans and Ainu people don't share any relations, it's only when they were under Hondo Japanese they have became contact. Both Ryukuans and Ainu didn't used to speak the modern Japanese language they had their own languages before the annexation. If Korea still part of Japan today, modern day Koreans certainly would lost their language too.
Even today, the largest port connection from Korea to Japan is located at Gyeongsang province. Also, Gyeongsang is most visited place for Japanese travelers to Korea. The main reason is the sea foods and climate is most closest to Japan.
Please don't ignore the geographical location of Gyeongsang regions and Japan.
