Kenkojuku student of Gichin Funakoshi. He was a member of Funakoshi's karate association the Dai Nihon Karate-do Shotokai. In 1942, Okano was given permission to start a karate research club named Kenkokai Karate-bu in his hometown of Hachiōji, Tokyo. The club was started with the help of Suzuki Shinjo, Kaneko Isamu and Takagi Yoshitomo. He renamed the dojo Kenkojuku Budokan in 1948. Okano's karate was influenced by both Gichin and Gigo Funakoshi, and eventually this branch of Shotokan became known as Kenkojuku Shotokan. He retained the Shotokai lineage as well as the name Shotokan. Okano was on the panel of Masters
Ryu Si-won held his 100th solo concert in Japan as part of his 16 concert tour in eight cities, including Yokohama, Nigata, Osaka, Sendai, Nagoya, and Fukuoka; with the final concert on 21 December at Saitama Super Arena. On 21 December 2011, Ryu was signed on by Japanese travel agency H.I.S, for one-year to promotion Korean tourism in Japan. Where he was featured in two 15-second commercials in the themes of "Let’s go to Korea" and "You are the character of your drama" for Japanese television in January 2012. In May 2012, Ryu starred in Channel A's drama "Goodbye Dear Wife" along