The Association of Korean Atomic Bomb Victims estimates that anywhere between 40,000 and 70,000 Koreans died in Hiroshima and Nagasaki when atomic bombs laid waste to the two cities in August 1945.
The Korean peninsula was under Japanese colonial rule at the time, and most of those who died had been conscripted by the Japanese military or forced into hard labour.
Consequently, the association argues that Koreans were multiple victims, deserving not only of an apology from the United States, but also from Japan.
Obama will tomorrow become the first sitting US president to visit Hiroshima and, while he has made it clear there will be no apology, there is concern in South Korea that his trip will play into a narrative that focuses on Japan's suffering, rather than the pain its colonial ambitions and wartime aggression inflicted on others.
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"The world thinks Japan is the atomic bomb victim. That is wrong," said 73-year-old Shim Jin-Tae, one of two-dozen protestors gathered outside the embassy.
Shim's parents had been moved to Japan as forced labourers. "The United States has never apologised for the atomic bomb and Japan, as a country that started the war, has never apologised," he said.
After the embassy protest, a 10-member delegation from the association was scheduled to fly to Japan to hold a separate ceremony in Hiroshima tomorrow at a small memorial erected for Korean victims. Shim said Obama should visit that memorial if he truly intended to commemorate all the victims of the bombings.