After graduating high school, Grandmaster Jeun enlisted in the South Korean Air Force, and taught as a Tae Kwon Do instructor. After he was discharged in 1967, Grandmaster Jeun began his career as a civilian instructor when he was appointed to the Tae Kwon Do Chung Do Kwan Central Dojang.

During this time, schools in several nations – including Canada, Argentina, Indonesia, and France –extended invitations to Grandmaster Jeun to provide his knowledge and expertise, but a sense of family obligation took precedent, keeping him from accepting.

By 1973, Tae Kwon Do had gained sufficient popularity globally to warrant a world championship. That same year, Grandmaster Jeun was extended an invitation to provide special training to the Hong Kong national team. An invitation to train the Singapore team in the same capacity came the following year.

Grandmaster Jeun's mother passed away in 1974, freeing him from his family obligations, and allowing him to propagate his knowledge of Tae Kwon Do to the western world. The country that Grandmaster Jeun chose to begin this new journey was France. During his time in France, Grandmaster Jeun taught in Paris and Grenoble.

In 1977, he was appointed as an instructor of the Grenoble Tae Kwon Do Association, and was also elected as part of the judging committee for selecting France’s national team for participation in the third World Tae Kwon Do Championship in Chicago. Grandmaster Jeun was also given the opportunity to observe the championships as a special guest of the Grenoble Tae Kwon Do Association. This opportunity marked Grandmaster Jeun's first visit to America, as well as to Des Moines, Iowa.

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Overview          Childhood                                        America