Choo Sung Hoon is a South Korean mixed martial artist based in Osaka, Japan. He was born on July 29, 1975, in Japan, where he is known by the names Yoshihiro Akiyama, Fukama and Sexyama. He is a fourth-generation Japanese of Korean descent. Choo Sung Hoon is a third-degree black belt in Judo and a black belt in Gaidojutsu and has won the gold medal for South Korea at the 2001 Asian Judo Championships and for Japan at the 2002 Asian Games. He also is the 2006 K-1 HERO’s Light Heavyweight Grand Prix tournament champion. Choo Sung Hoon opened a gym in Tokyo called the Akiyama Dojo, which teaches both judo and MMA, in 2009. Also that year, he married famous Japanese fashion model Shiho Yano, and they have one daughter, Sa Rang. Both father and daughter have starred in the popular Korean reality show “The Return of Superman” since 2013.