Question: Which South Korean mixed martial artist has been defeated by George Roop?

Related documents: [0]  [DOC] 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. [END] 
[1]  [DOC] 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. [END]  
Answer: Chan Sung Jung
Chan Sung Jung