How did Japan imperialized Korea?

The Empire of Japan waged an all-out war on the Korean culture. Schools and universities as in college refused to allow speaking the Korean language and emphasized manual labor and loyalty to the Emperor. Public places adopted Japanese, too, and ordered to make films in the Japanese language soon as followed.

Japan had been trying to become an Empire since 16th century, started with their invasion to Korea through 1592-1598 ... Japan felt like they needed to conquer, in order to make them equal with these Empires as well. So they became an imperialist nation. Japanese Empire fought to take over Korea, Taiwan.