http://en.wikipedia.org/wiki/Korea_under_Japanese_ruleJapanese war crimes
During Japanese Occupation of Korea, many Koreans became victims of Japanese war crimes. Korean villages found hiding resistance fighters were dealt with harshly, often with summary execution, rape, forced labour, preventable famine and looting.
Per Chosun Ilbo, to this day, valuable Korean artifacts can often be found in Japanese museums or among private collectors. According to the investigation of the South Korea government, There are 75,311 cultural assets that were taken from Korea. Japan has 34,369; the United States has 17,803. Today, Korea frequently demands the return of these artifacts to which Japan does not comply.
Koreans along with many other Asians were experimented on in Unit 731, a secret military medical experimentation units. The victims who died in the camp included at least 25 victims from the former Soviet Union, Mongolia and Korea. And the forced labor toll for Korea comes to 450,000 in Japanese proper.
During World War II, women who served in the Japanese military brothels were called Comfort women. Historians estimate the number of comfort women between 10,000 and 200,000, which include Japanese women. According to testimonies, there were cases that Japanese officials and local collaborators kidnapped or recruited under guise of factory employment poor, rural women from Korea (and other nations) for sexual slavery for Japanese military.
As investigations continue, more evidence continues to surface. There has been evidence of the Japanese government intentionally destroying official records regarding Comfort Women. Nonetheless, Japanese inventory logs and employee sheets on the battlefield show traces of documentation for government sponsored sexual slavery. In one instance, names of known Comfort Women were traced to Japanese employment records. One such woman was falsely classified as a nurse along with at least a dozen other verified comfort women who were not nurses or secretaries. Currently, the South Korean government is looking into the hundreds of other names on these lists.
Colonial Korea was subject to the same Leprosy Prevention Laws of 1907 and 1931 as the Japanese home islands. These laws permitted the segregation of patients in sanitariums where forced abortions and sterilization were common, even if the laws did not refer to it, and authorized punishment of patients "disturbing peace" as most Japanese leprologists believed that vulnerability to the disease was inheritable. In Korea, many patients were also subjected to hard labor.