Koreans learn the hanja, which are basically identical to traditional Chinese characters (hanzi) in secondary school. Kanji are more divergent from hanzi than kanji and if you want to be able to read a newspaper or textbook you’d probably need to add about 700 characters to the 1800 generally taught in Korea but that is a massive leg up. Japanese and Korean have very similar morphemes and grammar. And English education in Korea is historically dire though improving. They are not going to be mastering English after secondary school, on average.

https://en.wikipedia.org/wiki/Hanja

> South Korean primary schools abandoned the teaching of Hanja in 1971, although they are still taught as part of the mandatory curriculum in grade 6. They are taught in separate courses in South Korean high schools, separately from the normal Korean-language curriculum. Formal Hanja education begins in grade 7 (junior high school) and continues until graduation from senior high school in grade 12. A total of 1,800 Hanja are taught: 900 for junior high, and 900 for senior high (starting in grade 10).

https://en.wikipedia.org/wiki/Comparison_of_Japanese_and_Kor...

> Japanese and Korean both have an agglutinative morphology in which verbs may function as prefixes[13] and a subject–object–verb (SOV) typology.[14][15][16] They are both topic-prominent, null-subject languages. Both languages rely heavily on turning nouns into verbs utilizing "to do" (する and 하다).

> Modern Korean and Japanese share a similar system of demonstrative pronouns: i- (이), ku- (그) and ce- (저) for Korean corresponding to the Japanese ko- (こ), so- (そ) and a- (あ)(“this”, “that” and “that over there”). They both lack a compulsory distinction of plurality (for example "an apple" vs "apples" is usually not specifically distinguished).