Moosul Kwan Hapkido
Hap Ki Do is a self-defense-based martial arts system, incorporating numerous methods of attack and defense including strikes, joint manipulation, throws, take downs and weapons defense.  Though rooted in traditional techniques and philosophy, Hap Ki Do has continually modernized as culture has changed over the years.  The tendency of this martial art to change with the times ensures that it remains an effective means of self-defense to this day.
To fully understand the true meaning of Hap Ki Do, we must understand what each word means. “Hap” means harmony, unity, coordination, together, or concentrated. “Ki” means energy, inner power or cosmic force. “Do” means art, way of, achieve, or execute. Literally translated, Hap Ki Do means "The Art of Coordinated Power". 
There are three theories behind Hap Ki Do:

1.  Yu (flowing water)
2.  Won (circle)         
3.  Wha (harmony)    

Theory of Yu
The flowing water Theory

Look at water flowing easily down the mountain. When it comes upon a stone or solid rock, it flows around it. From this we see water does not waste time and energy by pushing the rock, but simply flows around it.

A single drop of water has no power or strength. However, many drops of water can cause great pain. So in this case use your whole body to attack, like fists, kicks, knees, elbows, head butts etc.

Water can shape into any form of vessel no matter what the shape. If you put water in a rounded or square vessel, water will shape into the vessel. The Hap Ki Do student should be like water and fit any situation. Whether standing, sitting or laying, Hap Ki Do defense should fit the situation. Whether you are tall, short, fat, or thin you should adapt your Hap Ki Do to fit.

When it comes to water and power, water can be the most powerful thing in the world, turning huge waves into weight and momentum. Like a dam springing a small leak, the dripping water will eventually penetrate the small hole so hard that the hole will become larger and larger. In the same manner, the Hap Ki Do student's strength will flow through the opponent with stronger and more effective techniques.
The strategy of the Hap Ki Do student comes from the water theory. So all together the Hap Ki Do student will adapt and stick to the fighter, by using momentum and applying water. The flowing techniques create other openings, which, in turn, invite other techniques. From this concept comes the idea of combat Flow.

The Theory of Won
The circular theory

The circular principles of Hap Ki Do are concepts that store momentum and leverage for executing the techniques in a natural flowing manner, allowing one to redirect the techniques constantly by merely changing the axis of the circle and with no loss of efficiency or balance. The natural, flowing, circular patterns allow the Hap Ki Do student to move from one technique to another almost instantaneously making the Hap Ki Do student a very elusive target and very dangerous.
The Hap Ki Do student will use a winding circular soft block to disrupt the opponent's force but also as a lack of resistance throws the opponent off balance. This circular motion will set up the aggressor into a position for a counter attack. The Hap Ki Do student should be like a twister or tornado. If anything stands in its way. It will feel the wrath of its centrifugal force. If the attackers punch does not enter into one's circle, and if the Hap Ki Do student chooses to block, it is considered a waste of time and energy. This is true with the same idea of the twister, if there is not an object in its way no harm will come to it.
The theory of circle is also applied for throws and for those Hap Ki Do kicks and strikes which are based upon circular or centrifugal force.

Theory of Wha
Harmony Theory

Harmony is the most important element one should achieve in Hap Ki Do training. The Hap Ki Do students' harmony must manifest itself by uniting the mind, body, spirit,techniques, and environment. Harmony is the most important element one should strive to achieve through their training. We practice what we are shown countless times so that our body and mind will eventually act as one unit in response to a confrontation.

But when faced with an attack, the true Hap Ki Do practitioner reacts by instinct, not through conscious thought. If one has to think about how to react, it is too late. This is why we practice our techniques over and over again. Merely knowing how to use a particular technique is not good enough. The Hap Ki Do student should not only memorize the techniques, but the student's harmony should be Reflexive, Second Nature, or Action without Thought.

After one achieves harmony within oneself, the next requirement is to harmonize with one's opponent. Having accomplished this, the Hap Ki Do student will find it quite easy to control the movements and energy of an opponent. The words"non-resistance" are often substituted for harmony in defining the theory. Before an attack can be directed in a circular manner, it must first be received or intercepted with a non-direct block or maneuver, thus allowing a harmony to be created using the opponent's oncoming force to fuel the defending motion.

Following this, is learning to harmonize with one's environment, this is the next stage. The final task is blending the harmony that one has developed.Accomplishing this, one will find it quite easy to read the min