In 1999, as a junior at Kyung Hee University, Chong was selected as a member of the South Korea national baseball team for the 1999 Intercontinental Cup in Sydney.
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As the only amateur player on the 24-man roster, Chong started two critical games against Team USA, facing Roy Oswalt as a starter in both of the games.
Tommy Chong | Hwa Chong Institution | Roh Tae-woo | Lee Chong Wei | Cheech & Chong | Chang Chong-Chen | Ping Chong | Jung Tae-woo | Suh Chong Kang | PLK Vicwood KT Chong Sixth Form College | Gordon Chong | Denise Chong | Chey Tae-won | Cheech & Chong's Wedding Album | Cheech and Chong's Up in Smoke | Cha Tae-hyun | Yoo Ji-tae | Yim Tae-hee | TAE Greek National Airlines | Park Tae-joon | Park Tae-Hwan | Pak Chong District | Miguel Ángel Osorio Chong | Michael Chong | Marcus Chong | Liu Chong | Liang Wen-Chong | Lai Meng Chong | Kim Tae-Jin (goalkeeper) | Kim Tae-Jin (footballer) |
During the Korean War, Hyon served as Kim Il-sung's bodyguard, a role which gave him "a place in North Korea's revolutionary history".
Hyon was promoted to the rank of Vice Marshal (차수) of the KPA in July 2012, two days after Chief of the General Staff Ri Yong-ho was relieved of his duties.
During his collegiate years at Dankook University, Ma was considered one of the top sidearm/submarine pitchers along with Chong Tae-Hyon of Kyung Hee University.