Initial ㄴ / ㄹ appearing in Sino-Korean words are kept in the North. In the South, in Sino-Korean words that begin with ㄹ which is followed by the vowel sound or the semivowel sound (when ㄹ is followed by one of ㅣ , ㅑ , ㅕ , ㅖ , ㅛ and ㅠ ), ㄹ is replaced by ㅇ ; when this ㄹ is followed by other vowels it is replaced by ㄴ . In the North, the initial ㄹ is kept.