UFC 2012 Submission of the Year winner was ranked #9 in the world by Sherdog in 2013.
He made his fighting debut with a submission victory at Pancrase 81 on June 24, 2007.
He tied the UFC record for fastest knockout with a 7-second win on December 10, 2011.
He was introduced to MMA by his aunt in Seoul, South Korea.
He was knocked out by a George Roop kick to the head on September 30, 2010.