Although after the withdrawal of Japanese forces from the Korean Peninsula, most Japanese castles were destroied, the Republic of Korea has been conducting investigations and research about those castles as valuable ruins that suggest historical relationships between the castle architecture in China, the Korean Peninsula and Japan.
なお、倭城は日本の撤兵後、ほとんど破壊されたが、近年、中国・朝鮮半島・日本の築城交流史をうかがえる貴重な遺構として、大韓民国でも調査・研究が進んでいる。