BRIEF HISTORY OF DO HAP SOOL Do Hap Sool school was first opened 1970. It's country of origin is Korea but it is unlike from any other Korean martial arts. It was created by IN HWAN CHUNG with great vision to create a new martial art style that will dominate any other form of martial arts. Each movement and the way it's taught are all original. All of it's forms contain continuous, flowing movements accented by furious strikes. The founder SABUNIM has worked on perfecting and polishing his techniques and ideals since 1970 to present.