Koguryo (or Goguryeo) history tells about the Sonbae, a strong warrior corp that was formed to protect Koguryo from hostile oppression. The word Sonbae, literally means, man of virtue who never recoils from fighting. It is believed that the Sonbae practiced Taekkyon, which was similar to subakki, a predecessor to today's taekwondo.
History books of the Joseon Dynasty also state that the Sonbae lived in groups, learning history and literary arts and going out to construct roads and fortresses for the benefits of society, always devoting themselves to the nation.
Uncovered by archaeologists in 1935. This mural appears on the ceiling of Muyong-chong, a royal tomb in southern Manchuria built during the Koguryo Dynasty. The construction of these tombs date back to the period between 3 A.D. and 427 A.D.