Chung's brother Chung Mong-hun, then the President of Hyundai Asan who pioneered South and North joint Mount Kumgang tour Business, committed suicide on Aug 4, 2003 when he was investigated by prosecutors for his alleged $400 millions cash remit to North Korea shortly before 2000 North-South summit. Initially this suspicion was raised from US when Congressional Research Service reported such allegation from CIA source on March 5, 2002. Upon hearing of such report, Grand National Party made use of this suspicion to attack the legitimacy of President Kim Dae-jung's government, and demanded thorough investigation through hearings and independent special prosecutors. Several weeks before leaving his office, President Kim gave an apology and advised no investigation for this matter for fear of aggravating North and South's relation, and Chung Mong-hun also confessed much of the allegations to public in his final attempt to evade investigation. But Grand National Party was resolute in its demand for formal investigation. Shortly after Roh's inauguration, Grand National Party passed the law entitling special prosecutors to investigate this case, taking advantage of its majority seats in National Assembly. Roh's regime wasn't able to refuse the demand of investigation, and Chung Mong-hun committed suicide when he was investigated about the use of $15 millions worth of Korean won which was suspected to had been money laundered after its withdrawal from Hyundai's bank accounts. In fact, the money wasn't part of $400 millions cash remittance to North Korea. North Korea blamed Grand National Party immediately after Chung Mong-hun's suicide. So Chung Mong-joon has joined the party which could be considered to be responsible for his brother's death, but Chung blames President Roh instead. In his autobiography which was published in 2011, Chung argues that President Roh didn't refuse Grand National Party's demand of investigation because he believes Roh actually wanted to investigate his brother to revenge on his withdrawal of supporting Roh in 2002 presidential election.