Around 2,400 years ago in the Chinese state of Yan, these bronze objects were circulated as currency.
But the myeongdojun on display here were not discovered in China.
In fact, back in 1935, archeologists found thousands of myeongdojun in North Pyeongan Province, which is now part of North Korea.
Roughly 70 years later, scholars confirmed that the currency was also used in the Gojoseon Kingdom.
More recently, archeologists excavated earthenware pottery and a t-shaped spear in Gapyeong, Gyeonggi Province.
Experts presume that these objects were made in 108 BC, right before Gojoseon collapsed.
Hoping to support more studies into the history of Gojoseon, the National Museum of Korea collected these artifacts and opened a permanent collection on November 3rd.
[Interview : Choe Kwang-shik, Director,
National Museum of Korea] "We have decided to open exhibition galleries for the Gojoseon and Buyeo Kingdom in order to establish a systematic way to study the past and to prevent neighboring countries from distorting Korean history."
[Reporter : Reporter: YOO DAL
firstname.lastname@example.org] A total of 200 objects are part of the permanent Gojoseon collection at the museum.
The artifacts tell the story of Korea's first kingdom, from its formation until its end.
Yoo Dal, Arirang News.