大韩帝国

There are various names of Korea in use today, derived from ancient kingdoms and dynasties. The modern English name Korea is an exonym derived from the Goryeo period and is used by both North Korea and South Korea in international contexts. In the Korean language, the two Koreas use different terms to refer to the nominally unified nation: Chosŏn (조선) in North Korea and Hanguk (한국) in South Korea.

Is word China came form Chin dynasty ?

In Chinese we call North Korea 朝鲜 while South Korea 韩国
but Korea in English
South Korea calls themselves Han , Han the word is firstly called by Japanese
After The First Sino-Japanese War, Korean changed their name to Empire of Kan
Kan is a Japanese pronunciation . I think this is the birth of word 韩国

Today, in China the youth call South Korea 韩国, even North Korea 北韩
they don’t wonder why there are two names for the Korea
去你妈的小日本