The features of Korean Martial Arts can be summed into three characteristics : Dynamic, Beautiful and Powerful. Korean martial arts have the universal features where Japanese and Chinese martial arts overlap. Thus you can get more easy start point to have whole oriental martial arts when you learned Korean martial arts.
Dynamic
Korean martial arts are much more dynamic compared to other martial arts. The best and easiest example may be the kicking techniques of Taekwondo. To use kicking techniques requires much more dynamic movements of whole body than to use punching. Simply to observe, every Korean cultures has such a dynamical ness. The original Korean music has really dynamic rhythms so that it is even powerful just as itself. Another example of dynamical ness is Korean style of Kendo. The Korean style of Kendo is more dynamic in that they are more attacking and trying to make the blind point of the opponent in the flowing motions while Japanese usually wait the occurrence of the blind point of the opponent by himself
Beautiful
Usually, the most attractive feature of Korean martial arts is its beautifulness. Many people like Taekwondo mainly because it is the most beautiful martial arts in the world.
Powerful
That Taekwondo is the most dynamic martial art is the logical ground of its powerfulness because the power comes from the movement of a thing. Stability may be a source of ability to catch chance but not that of power itself. Everyone can understand with ease that a kick is usually more powerful than a punch because it needs bigger movement. A calm motion can make big power at the high level, but it cannot be obtained without dynamic practices. No calm powerful skill can be obtained until one has fully understand the art.
There is Sing-I party in Chinese martial arts, who emphasizes the skills of crash but none outcomes them. But to Koreans it had been universalized to coach in martial skills earlier than Chinese. Thus we guess the Sing-I party of Chinese martial arts might have been generated from the general crash skills of Korean warriors. A visible proof may be considered that the local areas of origin of Chinese martial arts and that of excavations of Madeline bronze swords, which are unique to old Koreans, are almost same. I don't mean that Chinese martial arts are only a branch of Korean, which is really absurd. But I mean that it is rational to suppose that Chinese martial arts have been much influenced by Korean martial arts at least in its beginning period.