Dangbipa, traditional instrument, comes from China (Tang Dynasty 617/18 - 907) .
Has 4 strings. Was used for Dangak in the Goryeo Dynasty (936-1392) and for Hyangak in the Joseon Dynasty (1392-1897). More likely to be found in museums. With my 3D model replica I mainly kept to the drawings from the Akhak gwebeom (and online pictures of replicas in museums).
The Akhak gwebeom (악학궤범, "musical canon") is a nine-volume treatise on music, written in Korea in the 15th century, in the Joseon Dynasty