Chang's Yong-In Martial Arts (Taekwondo School)

Grand Master Sung-Chan Chang has over 38 years of martial arts experience. Grand Master Chang is a Seventh degree black belt in the traditional Korean martial art of Taekwondo, certified by the Kukkiwon. The Kukkiwon is the official World Headquarters

The internal changes are more important and are absolutely essential to succeed as a Taekwondo practitioner.
Background
Graduated From Yong-In University ( Taekwondo specializing )
Yong-In University, Master’s degree in Sports Management, specializing
7th Degree Black Belt Taekwondo
4th Degree Black Belt kick boxing
1994-2012 Korea YIMJIN Martial Arts Grand Master
The World Taekwondo Championship Competitive Sparring Gold Medalist In K