Kwang-Gae is named after the famous Kwang-Gae-Toh-Wang, the 19th King of the Koguryo Dynasty, who recovered all the lost territories including the greater part of Manchuria. The diagram represents the expansion and recovery of lost territory. The 39 movements refer to the first two figures of 391 AD, the year he came to the throne.
END: Bring the left foot back to a ready posture.
Notes:
In moves 5 and 7, it might help to consider the idea of your load up for the low guarding block being the action of reaching for a rope that when you perform the sliding motion you're grabbing the rope and using that to slide yourself backward. Contrary to a normal L-stance where the general motion of the body is in a downward motion consider yourself moving backwards into the L-stance. During this movement it's important that all motions are at the same time. The focus for this slide is on avoidance of a low attack.