Kumdo is an korean sword art, which is similar to Japanese kendo. Sword arts originate as far back 3000 years ago in the bronze age in korea, but really developed in the three kingdom era. The sword arts developed during this period heavily influenced the sword arts in japan. After the Japanese occupation, kumdo was forced to adopt Japanese uniforms, and this tradition still persists today, though many organizations also use korean uniforms.
Haidong Kumdo is a variant of kumdo that orijinated in the Baekje period, and has heavily influnced Japanese kenjtsu.
I study Chosun Sebup, the most ancient form of Kumdo, which dates back to the 14th century.