Where are the Korean-speaking countries that can only pass by train from China?

The two countries that speak Korean in the world are South Korea and North Korea. From China and Beijing, you can go directly to North Korea by train, passing through Jinbei, Shenyang, Benxi and Dandong, but you can't go to South Korea by train, you can only fly, so the country that speaks Korean by train from China is North Korea.

Korean, also known as Korean, is the mother tongue of the Korean Peninsula and the official language of South Korea.