Additionally, the government changed all official titles and place names in the country to Sino-Korean.
[6] Sino-Korean words constitute a large portion of South Korean vocabulary, the remainder being native Korean words and loanwords from other languages, such as Japanese and English to a lesser extent.
Sino-Korean words are typically used in formal or literary contexts,[5] and to express abstract or complex ideas.
[7] Sino-Korean words may be written either in the Korean alphabet, known as Hangul, or in Chinese characters, known as Hanja.
[6] The Middle Chinese final consonants were semivowels (or glides) /j/ and /w/, nasals /m/, /n/ and /ŋ/, and stops /p/, /t/ and /k/.