3rd degree black belt Adam Isla demonstrates Ko Dang hyung. This is the 15th hyung, and is learned at the 3rd degree black belt level. 

Ko Dang is the pseudonym of the patriot Cho Man -- Sik who dedicated his life to the independence movement and of Korea. The 39 movements of the pattern show the number of times of his imprisonment as well as the location of his birth on the 39th parallel.