The only family language in South Korea is Korean.
None. Japanese is part of the Japonic language family, which only includes languages from Mainland Japan and the Ryukyu Islands.
Korean
South Korea's official languages are Korean and Korean Sign Language. Their currency is 'won' or ₩.
Two countries have Korean as their official language: North Korea South Korea
Korean is the official language of only North Korea and South Korea. However, there are large minority groups that speak Korean in China, Japan, US, and Russia.
South Korea
Han-geul(한글) is used in South Korea. North and South Korea use same language but there's some different words.
The official language spoken in North Korea is Korean.
sometimes but not always
All language families are equally "important", but what is probably meant is: What is the name of the largest language family in South Africa, that is the language family having the most speakers who use it as their mother tongue? That would be the Nguni (comprising Zulu, Xhosa and Swazi languages).
No. South Korea and the Phillipines are separate countries with very different cultures and language.
The English language is the most prevalent foreign language in Korea because of the strong alliance between Korea and the United States, including the US military presence in Korea. However, the English language is not dominant in Korea, Korean is, and less than 10% of Koreans speak English.