The purpose of this study is to examine the existence of Japanese-Koreans that he intended to express in the film, focusing on the fact that the film world of director Oh Duck-soo is the world of Japanese-Koreans at the time of 70 years after liberation after 1945. Director Oh Duck-soo realized that not only himself but also Japanese-Koreans did not know his history well, and made a documentary film for Japanese -Koreans. The main contents of the film dealt with the issue of foreigner registration, the issue of fingerprinting system, the North Korean repatriation movement, post-war compensation and discrimination against women, and the issues of discrimination among Japanese-Koreans covering the modern and contemporary history of Japan. His film world, which treats Japanese-Koreans from the perspective of discrimination, is summarized as follows. First, it seems that director Oh Duck-soo's film world was influenced by the labor union movement after graduating from Waseda University and entering Toei. Second, director Oh Duck-soo was introduced to the Japanese film industry under the influence of Japanese film director Nagisa Oshima, but the relationship with the director was found to have chosen a completely separate path in terms of ideology. Third, Director Oh Duck-soo seems to be more convinced while dealing with the Japanese issue that the issue of discrimination between the emperor and villages exists as the biggest problem among the ideologies that dominate Japan. This is also leading to the hate speech problem today in Japan. Fourth, the purpose of the documentary film related to Japan by director Oh Duck-soo is interpreted as portraying Japan by portraying the irrationality of Japan in the sense of thinking about the problems of Japanese society through Japan. Through the film, he stipulated that the problem of Japan is the problem of Japan itself. In conclusion, it is believed that director Oh Duck-soo tried to express Japanese absurdity through films as a means of expressing “the existence of Japan” through Japan. His film is evaluated to have attempted to show through the unique visual world of Japanese-Koreans the double standard and irrationality of Japanese-Koreans by the Japanese government, and the search for the identity as a diaspora.