Question: Which South Korean mixed martial artist has been defeated by George Roop?
Context: Seo Hee Ham or Seohee Ham (Korean: 함서희 "ham seo-hi" ] ; born (1987--) 08, 1987 , written Ham Seo-Hee in Korean order), is a female South Korean mixed martial artist and kickboxer. Yui Chul Nam (Korean: 남의철, born July 16, 1981, Korean name is Nam Yui-Chul) is a South Korean mixed martial artist.  He formerly competed in the UFC's lightweight division after fighting in the Korean promotion Road FC. Kim Min-soo (born January 22, 1975) is a South Korean former judoka, professional mixed martial artist and K-1 kickboxer.  He is best known for becoming a K-1 World Grand Prix 2006 Finalist and also winning the 1996 Summer Olympics in Atlanta earning a Silver Medal in Judo.  He is also known for his fights with current WWE professional wrestler and former UFC Heavyweight Champion and veteran Brock Lesnar, former WWE wrestler and K-1 fighter Sean O'Haire and former NFL football player turned K-1 kickboxer and New Japan Pro Wrestling contender Bob Sapp.  Min-soo holds a notable kickboxing win over former UFC fighter Scott Junk.  He announced his retirement from contact sports in 2011 with brief stints as color commentator for Japanese and Korean mixed martial arts and professional wrestling events.  Kim is also the Judo head coach for Korean Top Team. Lim Hyun-Gyu (born January 16, 1985), often anglicized to Hyun Gyu Lim, is a South Korean mixed martial artist, currently signed to fight in the UFC's Welterweight division. Dong Hyun Kim (Korean: 김동현, 金東炫 ; born November 17, 1981) is a South Korean mixed martial artist currently fighting in the UFC's welterweight division.  He was signed by the UFC after fighting in the Japanese promotion DEEP and in the South Korean promotion Spirit MC.  As of 9 August, 2017, he is #12 in official UFC welterweight rankings. Choi Doo-Ho (born April 6, 1991), often anglicized to Dooho Choi or Doo Ho Choi, is a South Korean mixed martial artist who currently competes in the Ultimate Fighting Championship in their Featherweight division.  As of March 2017, Choi is ranked #12 in the official UFC featherweight rankings. Jung Chan-sung (Korean: 정찬성 born March 17, 1987, anglicized as Chan Sung Jung) is a South Korean mixed martial artist and kickboxer currently competing in the UFC's male Featherweight division.  A professional competitor since 2007, Jung has also formerly competed for the WEC, Pancrase, World Victory Road, and DEEP.  His nickname, "(The) Korean Zombie" comes from his ability to continue to move forward and fight aggressively, even after taking heavy blows.  Jung was serving in the South Korean army until October 2016 and thus was not ranked by most MMA media outlets, however he was ranked as #5 in official UFC Featherweight rankings beforehand. Kang Kyung-Ho (Korean: 강경호 , born September 9, 1987), often anglicized Kyung Ho Kang, is a South Korean mixed martial artist who competes in the UFC's bantamweight division. George H. Roop (born November 10, 1981) is an American mixed martial artist.  He was a cast member of Spike TV's "", winning his preliminary and first round fights.  He fought as a bantamweight in the UFC and most recently fought under the Road FC banner.  He holds notable victories over former WEC Bantamwight champion Brian Bowles and UFC featherweight contender Chan Sung Jung. Kim Jong-Man (born March 3, 1978), often anglicised to Jong-Man Kim, is a South Korean mixed martial artist who currently competes in the Featherweight division.  While Kim has mostly fought in South Korea, he has also appeared in many Japanese promotions including, the Sengoku Raiden Championships, DEEP, Shooto, K-1 Hero's, and Russia's M-1 Global.  He last fought at TOP FC - Original against Seung Hwa-Han.
Answer: Chan Sung Jung