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He spent more than two decades at the Ministry of Unification which he first joined as a researcher on communist countries at then-Board of National Unification in 1977. In 2002 he was appointed as the head of the Ministry and assumed the post until June 2004 serving two consecutive Presidents, Kim Dae-jung and Roh Moo-hyun. He was also credited with boosting inter-Korean cooperative projects including Kaesong Industrial Region, a landmark site of Inter-Korean cooperation.