Chung Do Mu Sool Won is a Royal Korean Martial art. The reason people tend to categorize it with hapkido because of Hapkido's popularity. In fact Chung Do is actually much older and has many differences to Hapkido, And there are many different styles of hapkido as well. Our style consist of Tan Jun breathing, Joint Manipulation, Pressure points, Body Throws, One Step Sparring, Wrist excapes, Chokes, Ground fighting, Kicking and Striking, and Weaponary ( Sword, Staff, Batton, Fan, polearms..ect) and more. Here is a good discription http://www.sa.niu.edu/hapkido/niupage.htm