Hungary signed a treaty of amity with North Korea in 1948, because they shared the same ideology. As for the archive, the treaty meant that both countries began to communicate regularly and periodically exchange official documents, and these documents would be kept in the archive. However, South Korea prohibited communications with socialist states because of the Korean War and the Cold War, so it was impossible to access the documents in the archive at that time. But the ex-socialist states experienced regime change, and as the countries changed, the public demand, on political grounds, for documents of the past regime became quite profound. In this paper, I introduce the National Archives of Hungary and the documents related to South and North Korea in brief. The main section focuses on the diplomatic relationship between Hungary and South Korea. With some documents, I tried to introduce rather than analyze. The study of these documents will encourage scholars and research workers to observe modern Korean history on the framework of an emerging paradigm. In particular, Especially, I would like to share my research and, from this time onwards, continue co-working with specialists in various fields, such as political philosophers and historians.