So where does Hapkido come from, is it an off-shoot of another style, or is it something that some guy just woke up and invented one day?
Check out this article as it contains a pretty good summary of elements of Traditional Hapkido and history. Also be advised that the history of Hapkido can be cloudy and different students of Hapkido may believe and practice different ways of Hapkido: http://www.martialartsplanet.com/magazine/articles/hapkido1.htm If you are referring to Combat Hapkido, which is a system created around traditional Hapkido but modified into a more MMA style with a Traditional core, see www.ichf.com