 Complete the following phrase:  Seo Hyun-deok born 9 May 1991 is a South Korean male table tennis player. He belongs to Samsung Life Insurance. He won six doubles titles on the ITTF World Tour between 2010 and 2014, including the victory at the 2014 ITTF World Tour Grand Finals. In 2015, he won a bronze medal in mens doubles event with Lee Sang-su at the 