>>214642382 (OP)
South Koreans are terroni of Korea (United). Koreans living in Japan are originally from North Korea (they are called Zainichi, literally meaning “foreign residents in Japan.” Since they came from North Korea, Japan—which does not recognize the country's existence—could only use that term).
North Koreans in Japan once occupied half of Japan's top 10 wealthiest individuals and were successful as businesspeople. Meanwhile, Koreans living in the United States are merely cheap laborers and still live in poverty.