Actually, if you want to get really technical, Koreans also use Chinese characters via Hanja, so it's possible to have a Korean sentence that's largely written in Chinese characters (also possible in Japanese using Kanji).
In fact, a lot of academic literature in Korea is still written mostly in Hanja. The actual switch to using Hangul only occured fairly recently (I mean in the last century or so) even though Hangul had been invented a long time ago it made very little sense to use it since most of the books you could get in Korea were from China anyway so it didn't make a lot of sense to suddenly go and start writing in Hangul if you were an academic.
I dunno what the sarcasm thing was though, it wasn't very funny or sarcastic seeming, but I figured I'd just point out that it actually is possible for Korean to have Chinese characters. In fact, Koreans are just about always named in Hanja.