外星人会说韩语

This translates to 'Aliens Speak Korean'. On a surface level, it’s humorous and nonsensical since, in general, we don’t assume aliens would know any human language, let alone a particular earthly one like Korean. Beyond literal sense, it implies the person or user likely identifies closely with or admires Korean culture. This might come from their interests including K-pop, Korean dramas, movies or anything that represents cultural characteristics from Korea.