Hanglish (한글리쉬) became popular after a Korean rap artist, Tyfoon did a small skit in one of his music videos featuring this “language.” Hanglish is not a literal mix between English and Korean but pronouncing Korean like English. This takes tremendous amount of skills because not only you have to speak Korean but you have to make it sound like English. For example, you would say “놀러” which means “to visit” in Korean. In Hanglish, you would say “놀러” like “No Love?” in English.
There are a number of copycats on Youtube who attempted this feat but failed miserably. Check out Tyfoon’s original skit.