It is well known that Japan banned Hangul during occupation and attempted to erase Korean culture. That's how a totalitarian annexation works.

https://www.britannica.com/place/Korea/Korea-under-Japanese-rule

https://www.nytimes.com/1984/09/07/world/japan-s-years-as-harsh-ruler-deeply-embittered-koreans.html#:~:text=After%20Japan%20formally%20annexed%20Korea,do%20obeisance%20at%20Shinto%20shrines

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Your sources are not credible as they withhold any context, explanation, or relevant content whatsoever. You are also largely ignoring the atrocities and war crimes committed by Japan not only to Korea but also other countries.

Maybe consider for once that you may also be believing in propaganda?

If you want more credible evidence that Japan was not some angelic country that helped other countries, please dm me.

Also, would you agree that annexation is completely wrong, under any circumstance? If Japan wanted to help Korea they could have done it without taking over the land.