A book discovered some time ago came as a surprise. I have taken a theoretical interest in the question regarding similarities between Japanese and Korean about which there is a thread in this forum. The book in question places the origin of Japanese in an area which would correspond more or less to North Korea (and Manchuria) of today, cf. Christopher I. Beckwith: “Koguryo: The Language of Japan’s Continental Relatives”, Brill’s Japanese Studies Library 2004 According to the publisher, this is part of the content: The Koguryo language is extinct, but did it “settle” in Japan back in the mist of time? How is this book being viewed among Japanese scholars, not to say by Japanese public opinion?