The Chang-Hun patterns system is named after the penname of General Choi Hong-Hi, the "Father of Taekwon-Do," who developed this set of patterns for Taekwon-Do. These patterns are called “tul,” which is the Korean term used by General Choi for pattern. As General Choi stated, “the life of a human being, perhaps 100 years, can be considered as a day when compared with eternity”. Therefore, there are a total of twenty-four officially recognized patterns in the art of Taekwon-Do, representing the 24 hours in a complete day, or one's complete lifetime. The name, number of movements, and the pattern diagram or symbol for individual “tul” have specific importance. Each symbolizes factors such as a notable Korean King, an important heroic figure in Korean History, or an instance relating to a significant event in Korean History.
Master Sam Albright, Kyo Sa Nim Tina Albright, and Kyo Sa Nim Kristen Love teach the Chang Hun system as directed by the Chang Hun Taekwon-Do Association and Grandmaster Derman Hodge.