Korean yen
The Korean yen was the currency of Korea between 1910 and 1945. It was equivalent to the Japanese yen and consisted of Japanese currency and banknotes issued specifically for Korea. The yen was subdivided into 100 sen. It replaced the Korean won at par and was replaced by the South Korean won and the North Korean won at par.
Mount Kumgang
The Mount Kumgang Tourist Region is thought to be one way for the North Korean government to receive hard currency from abroad. Therefore, the official currency of the tour is neither the South Korean won nor the North Korean won, but the US dollar. Since 2003, food and services to South Korean tourists are provided by some North Koreans. But most of the staff in the hotels are Chinese citizens of Korean heritage with Korean language skills. The area is developed by Hyundai Asan, which plans to expand the site with a proper ski resort to complement the current sleigh course, and complete golf courses. Many plans for expansion, however, are in their earliest stages.