|Revised Romanization||hapgi yusul|
Choi Yong Sul is often seen as the founder of Korean hapkido. After Choi returned to Korea in 1946 he started teaching a martial art he called yawara (=yusul). His students adapted these techniques to their own needs and added techniques from other styles, thus forming hapkido.
Hapki yusul practitioners try to stay loyal to the original techniques as taught by Choi. Which would be some kind of Daito Ryu with some kicks added. The use of hapki (better know as aiki in Japanese traditions) is greatly emphasized.
The modern hapkido yusul-movement is headed by Kim Yun Sang (김윤상) Choi's second successor (doju). Choi's first successor was his son Choi Bok Yeol (최복열) who unfortunately died in 1987, one year after his father.
Kim Yun Sang met with Choi Yong Sul in 1972. At that time he was already a hapkido practitioner for several years with a fourth degree black belt. He stayed with Choi until 1986, the year in which Choi Yong Sul died.
Only as recently as the year 2000 did Kim actively start promoting the art of hapki yusul as the 3rd doju. Kim teaches in Gumsan where his gym is located. The gym carries the name Yong Sul Kwan (용술관).
Outside of Korea there are only a few people who actively train hapki yusul. At the moment there are only six non-Koreans with a black belt in hapki yusul. Schools exist in the US, Australia, England, Italy and the Netherlands.
Kim Yun Sang visited several European countries in February 2008, teaching seminars in Germany, England and Italy.