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韓国語の映画を見るのは難しいです
Watching a Korean-language movie is difficult
A movie or film that is spoken in Korean
韓国語の映画を字幕なしで理解するのは大変だ
It's hard to understand a Korean movie without subtitles
This refers to any film where the primary language is Korean, regardless of country of production.
Be aware that 韓国語の映画 emphasizes the language, while 韓国映画 emphasizes the country of production.
Combination of 韓国語 (Korean language) + 映画 (movie/film)
Note that 韓国映画 can sometimes refer to movies produced in South Korea, while 韓国語の映画 specifically refers to the language used in the film.