Kim was authorized by Choi Yong Sul to use Choi's own name ("Yong Sul") as the name of his kwan (Yong Sul Kwan ()). Hapkiyusul members practice the original techniques and learning/teaching process as taught to Kim Yun Sang by Choi.
Kim was given permission by Choi Yong Sul to use Choi's own name ("Yong Sul") as the name of his kwan (Yong Sul Kwan), which is consistent with the original techniques and learning/teaching process taught by Choi to Kim Yun Sang.