2. Korean is the official language of South Korea, but it is called Korean in North Korea, and the two are essentially the same. Broadly speaking, "Korean" and "Korean" are the same language. In a narrow sense, "Korean" refers to the official language of North Korea and "Korean" refers to the official language of South Korea.
3. Korean majors are broad, including languages spoken by Koreans from North Korea, South Korea and China. But why is it called Korean professionally instead of Korean? This is mainly because after the founding of the People's Republic of Korea in 1949, the Democratic People's Republic of Korea, which belongs to the Eastern Group, was regarded as the legitimate government of the whole Korean peninsula. Therefore, at that time, the name of North Korea's country, nationality, language and culture was preceded by the word "North Korea", also known as "North Korea", and the establishment of diplomatic relations between China and South Korea was only in 1992.
4. Although the major is generally called Korean, in fact, all majors in universities are Korean now, and the practice of most schools is to add notes (Korean direction) to Korean majors.