 Complete the following phrase:  Yang placed fourth and just missed medaling in the individual vault final at the 2010 World Championships in Rotterdam, and would later become vault champion at the 2010 Asian Games and then 2011 World Artistic Gymnastics Championships in Tokyo, Japan. In 2012, he became the first Korean gymnast to win Olympic gold in gymnastics, winning the vault competition in London. In 2013, he went on to win gold in vault at the 2013 Summer Universiade in Kazan, Russia. He is famous in the gymnastics world for performing one of the five hardest vaults in the world, the Yang Hak Seon, which is a front handspring on and into three twists off in a layout position. It was unveiled in the individual vault final at the 