Hyang Bipa, also known as Jikgyeongbipa.
The shape of a water drop, has 5 strings.
Actually very rarely played and exhibited in museums. Dates from the Period of the Three Kingdoms 57 BC - 668 AD.
The lute can be traced back to both Chinese and Korean literature. It was one of Gogureyo's instruments and was later passed on to the Unified Silla 668-935 AD. 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