Kim Pyung-soo, also known as Kim Soo, is a South Korean taekwondo practitioner. He originally studied at the YMCA Kwon Bop Bu under Byung-In Yoon. After Yoon's disappeance Kim continued teaching at the Chung Do Kwan and also studied at the Kang Duk Won. When Nam Suk Lee found out he force Kim out of the Chung Do Kwan. After moving the United States, particularly Houston, Texas, Kim Soo opened his first school in his YMCA Kwon Bop Bu/Chang Moo Kwan/Kang Duk Won school under the "Chayon-Ryu" school.