1952 to 1986 In 1952 and 1957 he was twice appointed as the Chief of Staff. Afterwards, in 1959 he was appointed as the Joint Chief of Staff of the
Republic of Korea Army. After retiring from the military, he was appointed ambassador to the
Republic of China in July 1960. In July 1961, he served as the Republic of Korea ambassador to
France,
the Netherlands,
Belgium,
Spain,
Portugal and
Luxembourg. On July 16, 1961, while serving as ambassador to France, he traveled to
Senegal as a representative of the Korea-Senegalese Friendship Mission. There he met with Senegalese Prime Minister Dudu Thiam. In 1961, he served as ambassador to
Gabon,
Togo,
Senegal,
Chad,
The Congo,
Madagascar,
Central African Republic,
Niger,
Ivory Coast,
Benin,
Republic of the Congo,
Upper Volta and
Mauritania. On August 27, 1963, while serving as the South Korean ambassador to
Cameroon, Paik (then adjunct ambassador to France), established relations with President Amadou Ahizo. In July 1965, Paik served as the first Korean Ambassador to
Canada, after which he was appointed the Minister of Transportation of Korea in October 1969. Paik directed the construction of Seoul's public transportation infrastructure, which included the subway system. In 1971, he was appointed president of Chungju Fertilizer Co., and served as president of Korea Integrated Chemical Inc. After which, he was appointed as the director of the National Economic Association. Then in 1972, he completed a CEO course at
Yonsei University business school and in 1973 was presented a certificate by the chief executive officer of
Korea University business school. He was appointed president of Korea Chemical Industries in April 1973, where he directed the construction of the largest fertilizing manufactory plant in Southeast Asia at the time. He was later appointed president of adjunct Korea Chemical Pulp in 1974 and became president of the Fertilizer Industry Association in 1975. from 1976 to 1981, he served as director of the Korea Chemical Research Institute. In 1976, he completed a CEO course at Seoul National University business school. In March 1981, he resigned from his position as President of Korea Chemicals. In March 1980, after resigning from the presidency of Korea Chemical Industries he was appointed as an adviser to Fujitsu Korea. Later he was appointed the chairman of the Korea Chemical Research Institute, director of the Korea Chemical Research Institute, and National Chairperson of the International Chamber of Commerce and Industry and was appointed to the permanent Advisory Office of the National Unification Agency in 1986, which included conducting security and lecture activities.
1998 to 2020 In 1998, he was appointed chairman of the Commemorative Projects Committee on the 50th anniversary of the
Korean War. From 1999 to 2001 he was selected to be the Advisory Chairman of the Advisory Committee of the
No Gun Ri Incident Countermeasures Group. In 2013, the U.S. military in Korea appointed him as an "Honorary
U.S. 8th Army Commander" and as whom he would represent the U.S. 8th Army in Korea during various official events. In South Korea, President
Lee Myung-Bak attempted to promote Paik Sun-yup to the position of the First Head of the ROK Armed Forces, but this was ultimately denied. Then in 2008, in the Pro-Japanese Personalities and People's Exhibition published by the Institute for National Affairs included Paik in the military section of prospective
chinilpa candidates, due to his prior service in the
Manchukuo Imperial Army. Furthermore, in 2009, the
Roh Moo-hyun administration's National Behavior Commission included Paik Sun-yup in the highly controversial list of 705 chinilpas. In May 2008, he was appointed as an advisor to the Committee to Promote the 60th Anniversary of the Founding of the Republic of Korea. On March 23, 2009, it was reported that the South Korean government planned to honor Paik as an honorary
marshal in honor of the 60th anniversary of the outbreak of the Korean War. If implemented, Paik would have become South Korea's first marshal, this however would not come to fruition. On January 30, 2019, a group in consisting of retired South Korean generals of which Paik served as an advisor, released a statement criticizing the administration of South Korean President
Moon Jae-in and the Comprehensive Military Agreement which was signed with North Korea at the
September 2018 inter-Korean summit in Pyongyang. He died on July 10, 2020, at the age of 99, four months short of his 100th birthday and was buried in
Daejeon National Cemetery.
Ministry of Patriots and Veterans Affairs claimed the reason Paik was buried in Daejeon National Cemetery was because the designated area for generals in
Seoul National Cemetery was full. ==Awards and decorations==