I have learned in documentaries in Japan that the Koreans abolished the usage of hanjas in order to protest against the Japanese...As far as I know the Japanese have only created Hiragana and Katakana...
The Korean garmmar is similar to Japanese, the sentences construction is subject, object, verb. Actually, Kanji, Hiragana, Katakana, each of them has a respective function:
1, KANJIs are used for loan words from ancient China.
2, KATAKANAs are used for load words from modern Occidents, such as USA, UK, Germany, France, & etc.
3, HIRAGANAs are used for Japanese inherent words.
Korean language:
Each Hanja has its corresponding Hangul pronunciation, if a Japanese was trained to master their relations between Hanja and Hangul, it would be not difficult to guess which Hanja this Hangul is supposed to mean. And if we know the corresponding vocabularies, it is obvious that, we'll be able to comprehend right away what this word means.
Korean writing system is much newer and more creative and logical than Japanese writing system(Hiragana and Katagana) so korean don't need Chinese characters in their language very much as Japanese do.
Note: I know both Chinese and Japanese. So, Korean just took me three months to learn, writting and reading kangul is easy.