Kim Won-hong rose to prominence in 2003, as he was appointed commander of the Military Security Command following the death of General Won Ung-hui, who had been heading it since 1990. In April 2009, Kim was promoted to General and then migrated to the KPA General Political Bureau's Department, at the same time when Kim Jong-il reportedly put Kim Jong-un in charge of the Ministry of State Security to which the Military Security Command is affiliated. Kim was also made a member of the Party's Central Committee and Central Military Commission in September 2010 and was reported to having a role in ensuring Kim Jong-un's succession. After Kim Jong-il's death and acting head of State Security Department, U Tong-chuk's purge, Kim Won-hong appeared as one of Kim Jong-un's most trusted and supporting generals. He was made a Politburo member as well as the first minister of State Security in 25 years in April 2012. He was also elected member of the National Defence Commission. The South Korean government reported in February 2017 that Kim Won-hong was fired in mid-January after he was demoted to a one-star general from a four-star one on charges of corruption and abuse of power. He then disappeared from public view, but resurfaced in April 2017 for Day of the Sun celebrations, bearing the four-star insignia on his uniform. In late November 2017, Kim Won-hong was named as one of two North Korean officials punished for "impure behavior." According to South Korean Rep. Kim Byunk-kee, Kim Won Hong, identified as deputy director of North Korea's General Political Bureau, was reportedly punished along with the director of that bureau, identified as Hwang Pyong So. The form of punishment was unspecified. Despite being punished he did appear at an April 2017 parade, though when Kim Jong-Un walked by it appeared he was ignored possibly indicating he had lost some favor with him. In May 2017, he was appointed to Deputy Director of the KPA General Political Department. In September he was under investigation again and removed from the position with the WPK Organization and Guidance Department. During April and May 2018, he lost his positions as WPK Political Bureau, WPK Central Military Commission and the State Affairs Commission.