In Chapter 1, Section 4 of Kang Won Sik and Lee Kyong Myong’s “A History of Modern Taekwondo,” there is detail about a “Yun Moo” demo held by Yoon Byung In’s YMCA Kwon Bup Bu (Changmoo Kwan) on June 24, 1949. According to the book's account, “PARK Chul Hee demonstrated the "Jak Do Kwon", PARK...