|Born||May 18, 1920|
|Died||April 3, 1983 (Aged 63)|
|Style||Chuan Fa, Shudokan Karate|
|Rank||5th dan Shudokan Karate|
|Revised Romanization||Yun Byeongin|
Yoon Byung-in (May 18, 1920 – April 3, 1983), also known in English reference as Byung-in Yoon, was a Korean Grandmaster of martial arts. He is believed to be the first Korean national to study Chuan Fa (Chinese Gung Fu) in China and to return to teach it in Korea. He was an influential instructor to many current and past Masters and Grandmasters, and himself a master of many styles and studies of Martial Arts.
The parents of Yoon Byung-in suffered under the Japanese occupation of Korea and fled to Manchuria. After diligent efforts to impress a Mongolian Chuan-fa master, the child Byung-In was permitted to study Chuan Fa or Gung Fu.
Yoon studied Chinese Chuan Fa under the guidance of a Mongolian instructor in Manchuria. Later, Yoon trained Karate at the Nihon University karate club in Japan with Kanken Tōyama. He was not initially engaged in karate training at the university, but was often seen practicing conditioning exercises against a courtyard tree. This tree reportedly started leaning from his practice. At one point, Japanese karate students pursued and started to beat up another Korean karate student who had skipped karate class to spend time with his sweetheart. After being persuaded by the other Korean student for help, Yoon used his Chuan Fa to skillfully deflect and evade the karate students’ strikes and kicks to the point that they gave up and ran back to tell their teacher what had happened. Teacher Tōyama invited Yoon to tell him about the skillful non-karate martial art he used against his students. Yoon explained to Toyama about his Chuan-fa education in Manchuria. Toyama appreciated the Chuan-fa background since he (Toyama) had studied Chuan-fa in Taiwan for 7 years, previously. They decided to exchange knowledge; Yoon would teach Toyama Chuan Fa and Toyama would teach Yoon his Shudokan Karate. Yoon later created his art and called it Kwon Bop Kong Soo Do. Unlike other taekwondo kwans (schools), early Chang Moo Kwan was mainly based on Chinese Chuan-fa and Shudokan karate. The early Chang Moo Kwan taught the forms, Dan Kwon (단권, short fist), Chang Kwon (장권, Long Fist), Tai Jo Kwon (태조권, Fist of the Founding King), Pal Gi Kwon (팔기권, Eighth Manchurian Cavalry), and Doju San (토조산, Escaping Mist). In addition, they practiced a staff form developed by Yoon Byung-in and a staff form developed by Yoon Byung-in's friend and Jidokwan founder, Yoon Kwe-byung.
From 1951 to 1966, the whereabouts and activities of Yoon are unknown, as he traveled to North Korea in August 1950 with his older brother, Yoon Byung-du, a Captain in the North Korean Army.
In 1966 and 1967, he taught 'Gyuck Sul(격술, special combat strategy)' to North Korean special forces of the Moranbong. In late 1967, Master Yoon completed his assignment and returned to his supervisor position at a concrete factory in Chongjin, where he worked until his death from lung cancer in April 1983.
Yoon, Byung-in (kneeling, center) with students during special weekend training session (ca. 1947).