Korean
South Korea's official languages are Korean and Korean Sign Language. Their currency is 'won' or ₩.
South Korea and North Korea are the primary countries where Korean is the official language. Additionally, Korean is also an official language in the Yanbian Korean Autonomous Prefecture in China.
South Korea and North Korea have Korean as the principal language.
The only family language in South Korea is Korean.
There are quite a few different ways to express "thank you" in the Korean language. Some of the most common are:감사합니다 (kamsahamnida)- formal고맙습니다 (komapseumnida) - formal고마워 (gomawo)- casual
Well technically, there is no such thing as a language called "South Korean". The language is just Korean but there are variations in accents and things. It is how the accent of a person in New York is different from that of person that lives in Texas.
I assume by the phrasing the the question is asking about the language. The Korean language has been altered as a result of the Korean War. The isolation of North Korea has allowed the Korean language there to change more rapidly and in a different direction from the Korean language spoken in South Korea and among Korean expatriates. The Northern accent is a little odd to the Southern ear, but relatively understandable. Northerners understand South Koreans better than South Koreans understand Northerners because of increased similarities between "modern" South Korean Korean and the Korean of the 1950s. However, since the Hangul alphabet long predates the US/Soviet division of the Peninsula, both North and South Korea continue to use this endemic alphabet.
Gangnam style refers to a lifestyle in South Korea, and the original language is Korean. (The word "style" is adopted from English.)
Films shown in theatres that are not in Korean are usually shown in the original language with Korean subtitles.
"Kamsahamnida" (감사합니다) means "thank you" in Korean.
Korean Language Day is celebrated on October 9th in South Korea to honor the Korean alphabet, known as Hangul. This day commemorates the invention of Hangul by King Sejong the Great in the 15th century. It aims to promote the importance and beauty of the Korean language.