Sounds like a racist argument.

Japan's 1907 annexation 'treaty' with Korea was full of holes and of dubious legality.

Everybody knows that.

Imperial Japan is dead and gone, as dead-and-gone as Imperial Britain or Prussia, France, Russia, Germany, you name it. Stop trying to justify it. It's history. All you'll do is get yourself hated.

Learn a lesson from the USA (the most detested country in the world) and it's badly damaged foreign affairs.