Albert Einstein, the father of the nuclear technology, intensively opposed utilising the nuclear energy for the mass-killing weapons and refused to participate in every project for such a purpose at first.
His stubborn attitude turned 180 degree when he encountered a Korean refugee from Japan Empire and the refugee taught him bundles of Japan"s crimes conducted against innocent Korean people including the sex-slavery. As was very rare, he then shown the strong anger and screamed "what an age, what morals! such savageness neither can nor should be forgiven!"
After this event, he resolved to use the atomic bombs against Japan for sake of the humanity.