Nah, you're off here. I've lived in both South Korea and Japan for extended periods of time. There is no comparison between the two - while there is bitterness in Japan, it's 10 fold in South Korea.
I will never forget one class where I was teaching these really young kids (12-ish) English, and the materials we had been given to teach were all about nuclear war, tension between nations, etc. from the BBC website and such. I told my students "well, up till now, only the USA has ever used an atomic bomb," and they were shocked having never known that before. They asked where, and I said "Japan. Twice." and their little faces just lit up with glee, and this little girl had a huge smile on her face and asked me how many Japanese people died.
It was really stupid of me to introduce such a heavy subject like that... but my company was retarded for giving the teachers such ridiculous materials for 12 year olds.
Yeah... There's bitterness.