Former United Nations Secretary General Ban Ki-moon attends a group memorial for the victims of a stampede during a Halloween festival, at Seoul City Hall Plaza in Seoul, South Korea, October 31, 2022. REUTERS/Heo Ran 

Former United Nations Secretary General Ban Ki-moon attends a group memorial for the victims of a stampede during a Halloween festival, at Seoul City Hall Plaza in Seoul, South Korea, October 31, 2022. REUTERS/Heo Ran 

Tokyo 2020 Olympics - The Tokyo 2020 Olympics Opening Ceremony - Olympic Stadium, Tokyo, Japan - July 23, 2021. Former United Nations Secretary General Ban Ki-moon wearing a protective face mask arrives ahead of the opening ceremony Pool via REUTERS/Leon Neal 

A worker walks past a picture of former U.N. Secretary General Ban Ki-moon in the lobby of the United Nations building during the 75th annual U.N. General Assembly high level debate, which is being held mostly virtually due to the coronavirus disease (COVID-19) pandemic in the Manhattan borough of New York City, New York, U.S., September 21, 2020. REUTERS/Carlo Allegri 

Former United Nations Secretary General Ban Ki-moon arrives ahead of the start of the 74th session of the United Nations General Assembly at U.N. headquarters in New York City, New York, U.S., September 24, 2019. REUTERS/Yana Paskova 

A man walks past portraits of former United Nations Secretary Generals Kofi Annan (L) and Ban Ki-moon at U.N. headquarters during the 2019 United Nations Climate Action Summit at U.N. headquarters in New York City, New York, U.S., September 23, 2019. REUTERS/Yana Paskova 

Former UN Secretary General Ban Ki-moon shakes hand of China's Premier Li Keqiang as he stands near Netherlands' Prime Minister Mark Rutte during the Global Commission on Adaptation ceremony, at the Great Hall of the People in Beijing, China June 27, 2019. Fred Dufour/Pool via REUTERS 

Netherlands' Prime Minister Mark Rutte, China's Premier Li Keqiang and Former U.N. Secretary General Ban Ki-moon arrive for the Global Commission on Adaptation ceremony, at the Great Hall of the People in Beijing, China June 27, 2019. Fred Dufour/Pool via REUTERS 

Netherlands' Prime Minister Mark Rutte, China's Premier Li Keqiang and Former U.N. Secretary General Ban Ki-moon react next to an official board during the Global Commission on Adaptation ceremony, at the Great Hall of the People in Beijing, China June 27, 2019. Fred Dufour/Pool via REUTERS 

Netherlands' Prime Minister Mark Rutte, China's Premier Li Keqiang and Former U.N. Secretary General Ban Ki-moon arrive for the Global Commission on Adaptation ceremony, at the Great Hall of the People in Beijing, China June 27, 2019. Fred Dufour/Pool via REUTERS 

Netherlands' Prime Minister Mark Rutte, China's Premier Li Keqiang and Former U.N. Secretary General Ban Ki-moon shake hands next to an official board during the Global Commission on Adaptation ceremony, at the Great Hall of the People in Beijing, China June 27, 2019. Fred Dufour/Pool via REUTERS 

China's Premier Li Keqiang speaks to Netherlands' Prime Minister Mark Rutte and Former U.N. Secretary General Ban Ki-moon during the Global Commission on Adaptation ceremony, at the Great Hall of the People in Beijing, China June 27, 2019. Fred Dufour/Pool via REUTERS 

Former U.N. Secretary General Ban Ki-moon delivers a speech to China's Premier Li Keqiang and Netherlands' Prime Minister Mark Rutte during the Global Commission on Adaptation ceremony, at the Great Hall of the People in Beijing, China June 27, 2019. Fred Dufour/Pool via REUTERS 

Former U.N. Secretary General Ban Ki-moon delivers a speech to China's Premier Li Keqiang and Netherlands' Prime Minister Mark Rutte during the Global Commission on Adaptation ceremony, at the Great Hall of the People in Beijing, China June 27, 2019. Fred Dufour/Pool via REUTERS 

Former U.N. Secretary General Ban Ki-moon delivers a speech to China's Premier Li Keqiang and Netherlands' Prime Minister Mark Rutte during the Global Commission on Adaptation ceremony, at the Great Hall of the People in Beijing, China June 27, 2019. Fred Dufour/Pool via REUTERS 

Netherlands' Prime Minister Mark Rutte shakes hand with Former U.N. Secretary General Ban Ki-moon during the Global Commission on Adaptation ceremony, at the Great Hall of the People in Beijing, China June 27, 2019. Fred Dufour/Pool via REUTERS 

Former U.N. Secretary General Ban Ki-moon delivers a speech to China's Premier Li Keqiang and Netherlands' Prime Minister Mark Rutte during the Global Commission on Adaptation ceremony, at the Great Hall of the People in Beijing, China June 27, 2019. Fred Dufour/Pool via REUTERS 

Netherlands' Prime Minister Mark Rutte speaks to China's Premier Li Keqiang and Former U.N. Secretary General Ban Ki-moon during the Global Commission on Adaptation ceremony, at the Great Hall of the People in Beijing, China June 27, 2019. Fred Dufour/Pool via REUTERS 

Netherlands' Prime Minister Mark Rutte speaks to China's Premier Li Keqiang and Former U.N. Secretary General Ban Ki-moon during the Global Commission on Adaptation ceremony, at the Great Hall of the People in Beijing, China June 27, 2019. Fred Dufour/Pool via REUTERS 

Netherlands' Prime Minister Mark Rutte speaks to China's Premier Li Keqiang and Former U.N. Secretary General Ban Ki-moon during the Global Commission on Adaptation ceremony, at the Great Hall of the People in Beijing, China June 27, 2019. Fred Dufour/Pool via REUTERS 

Former U.N. Secretary-General Ban Ki-moon, his wife Yoo Soon-taek, Mukesh Ambani, the Chairman of Reliance Industries, and his wife Nita Ambani pose during a photo opportunity at the wedding ceremony of Mukesh's son Akash Ambani at Bandra-Kurla Complex in Mumbai, India, March 9, 2019. REUTERS/Francis Mascarenhas 

Former U.N. secretary-general Ban Ki-moon and his wife Yoo Soon-taek pose during a photo opportunity at the wedding ceremony of Akash Ambani, son of the Chairman of Reliance Industries Mukesh Ambani, at Bandra-Kurla Complex in Mumbai, India, March 9, 2019. REUTERS/Francis Mascarenhas 

Chinese President Xi Jinping meets head of the International Olympic Committee's ethics commission, former UN Secretary-General Ban Ki-moon at the Great Hall of the People in Beijing, China, May 15, 2018. REUTERS/Thomas Peter/Pool 

Chinese President Xi Jinping meets head of the International Olympic Committee's ethics commission, former UN Secretary-General Ban Ki-moon (not pictured) at the Great Hall of the People in Beijing, China, May 15, 2018. REUTERS/Thomas Peter/Pool 

Chinese President Xi Jinping meets head of the International Olympic Committee's ethics commission, former UN Secretary-General Ban Ki-moon (not pictured) at the Great Hall of the People in Beijing, China, May 15, 2018. REUTERS/Thomas Peter/Pool 

Chinese President Xi Jinping meets head of the International Olympic Committee's ethics commission, former UN Secretary-General Ban Ki-moon (not pictured) at the Great Hall of the People in Beijing, China, May 15, 2018. REUTERS/Thomas Peter/Pool 

Chinese President Xi Jinping meets head of the International Olympic Committee's ethics commission, former UN Secretary-General Ban Ki-moon at the Great Hall of the People in Beijing, China, May 15, 2018. REUTERS/Thomas Peter/Pool 

Chinese President Xi Jinping meets head of the International Olympic Committee's ethics commission, former UN Secretary-General Ban Ki-moon at the Great Hall of the People in Beijing, China, May 15, 2018. REUTERS/Thomas Peter/Pool 

Head of the International Olympic Committee's ethics commission, former UN Secretary-General Ban Ki-moon meets Chinese President Xi Jinping (not pictured) at the Great Hall of the People in Beijing, China, May 15, 2018. REUTERS/Thomas Peter/Pool 

IOC President Thomas Bach speaks with former U.N. Secretary-General Ban Ki-moon as they attend the President's Dinner on the eve of the Opening Ceremony for the Pyeongchang 2018 Winter Olympics in Pyeongchang, South Korea, February 8, 2018. REUTERS/Eric Gaillard 

IOC President Thomas Bach, his wife Claudia, former U.N. Secretary-General Ban Ki-moon and his wife Yoo Soon-taek pose at the President's Dinner on the eve of the Opening Ceremony for the Pyeongchang 2018 Winter Olympics in Pyeongchang, South Korea February 8, 2018. REUTERS/Eric Gaillard 

Members of the Elder group, former Secretary-Generals of the United Nations Kofi Annan (L) and Ban Ki-moon (R) sit across from France's President Emmanuel Macron at the Elysee Palace in Paris, France, December 11, 2017. REUTERS/Michel Euler/Pool 

L-R, Director General of the World Health Organisation, Dr. Gro Harlem Brundtland, Kofi Annan, former United Nations Secretary-General, Chair of the Elders, former Irish President Mary Robinson, Lakhdar Brahimi, a former UN-Arab League Envoy to Syria, and former UN Secretary-General Ban Ki-moon leave after a meeting at the Elysee Palace in Paris, France, December 11, 2017. REUTERS/Gonzalo Fuentes 

L-R, Director General of the World Health Organisation, Dr. Gro Harlem Brundtland, Kofi Annan, former United Nations Secretary-General, Chair of the Elders, former Irish President Mary Robinson, Lakhdar Brahimi, a former UN-Arab League Envoy to Syria, and former UN Secretary-General Ban Ki-moon leave after a meeting at the Elysee Palace in Paris, France, December 11, 2017. REUTERS/Gonzalo Fuentes 

Newly elected head of the International Olympic Committee's ethics commission, former UN Secretary-General Ban Ki-moon speaks during the 131st IOC session in Lima, Peru, September 14, 2017. REUTERS/Guadalupe Pardo 

Newly elected head of the International Olympic Committee's ethics commission, former UN Secretary-General Ban Ki-moon speaks during the 131st IOC session in Lima, Peru, September 14, 2017. REUTERS/Guadalupe Pardo 

Newly elected head of the International Olympic Committee's ethics commission, former UN Secretary-General Ban Ki-moon speaks during the 131st IOC session in Lima, Peru, September 14, 2017. REUTERS/Guadalupe Pardo 

Newly elected head of the International Olympic Committee's ethics commission, former UN Secretary-General Ban Ki-moon attends the 131st IOC session in Lima, Peru, September 14, 2017. REUTERS/Guadalupe Pardo 

Peru's President Pedro Pablo Kuczynski and former UN Secretary-General Ban Ki-moon pose for picture during the 131st IOC session in Lima, Peru, September 14, 2017. REUTERS/Guadalupe Pardo 

Peru's President Pedro Pablo Kuczynski, International Olympic Committee (IOC) President Thomas Bach and former UN Secretary-General Ban Ki-moon pose for picture during the 131st IOC session in Lima, Peru, September 14, 2017. REUTERS/Guadalupe Pardo 

International Olympic Committee (IOC) President Thomas Bach and former UN Secretary-General Ban Ki-moon pose for picture during the 131st IOC session in Lima, Peru, September 14, 2017. REUTERS/Guadalupe Pardo 

French President Emmanuel Macron (C) stands with former French foreign minister Laurent Fabius (L) and former UN Secretary-General Ban Ki-moon as they attend the 'World Environment Pact' meeting at the Sorbonne where he promised to play an active role in a campaign aimed at securing a global pact to protect the human right to a clean and healthy environment in Paris, France, June 24, 2017. REUTERS/Etienne Laurent/Pool 

French President Emmanuel Macron (C) stands with former French foreign minister Laurent Fabius (L) and former UN Secretary-General Ban Ki-moon as they attend the 'World Environment Pact' meeting at the Sorbonne where he promised to play an active role in a campaign aimed at securing a global pact to protect the human right to a clean and healthy environment in Paris, France, June 24, 2017. REUTERS/Etienne Laurent/Pool 

FILE PHOTO - Former U.N. secretary-general Ban Ki-moon attends a media roundtable in Seoul, South Korea, January 25, 2017. REUTERS/Kim Hong-Ji/File Photo TPX IMAGES OF THE DAY 

Former U.N. Secretary-General Ban Ki-moon speaks during his news conference in Seoul, South Korea January 31, 2017. REUTERS/Kim Hong-Ji 

Former U.N. Secretary-General Ban Ki-moon speaks during his news conference in Seoul, South Korea January 31, 2017. REUTERS/Kim Hong-Ji 

Former U.N. Secretary-General Ban Ki-moon speaks during his news conference in Seoul, South Korea January 31, 2017. REUTERS/Kim Hong-Ji 

Former U.N. Secretary-General Ban Ki-moon speaks during his news conference in Seoul, South Korea January 31, 2017. REUTERS/Kim Hong-Ji 

Audience watch a TV broadcasting former U.N. secretary-general Ban Ki-moon at a media roundtable, outside the venue in Seoul, South Korea, January 25, 2017. REUTERS/Kim Hong-Ji 

Former U.N. secretary-general Ban Ki-moon is escorted by his bodyguards upon his arrival at a media roundtable in Seoul, South Korea, January 25, 2017. REUTERS/Kim Hong-Ji 

Former U.N. secretary-general Ban Ki-moon attends a media roundtable in Seoul, South Korea, January 25, 2017. REUTERS/Kim Hong-Ji 

Former U.N. secretary-general Ban Ki-moon speaks at a media roundtable in Seoul, South Korea, January 25, 2017. REUTERS/Kim Hong-Ji 

Former U.N. secretary-general Ban Ki-moon attends a media roundtable in Seoul, South Korea, January 25, 2017. REUTERS/Kim Hong-Ji TPX IMAGES OF THE DAY 

Joo Hyun Bahn (L), a nephew of former U.N. Secretary-General Ban Ki-moon, leaves a hearing in the federal court in Manhattan with his lawyer, Julia Gatto in New York City, New York, U.S. January 20, 2017. REUTERS/Nate Raymond 

Joo Hyun Bahn (L), a nephew of former U.N. Secretary-General Ban Ki-moon, leaves a hearing in the federal court in Manhattan with his lawyer, Julia Gatto in New York City, New York, U.S. January 20, 201. REUTERS/Nate Raymond 

Former U.N. secretary-general Ban Ki-moon burns incense during his visits to the natioanl cemetery in Seoul, South Korea, January 13, 2017. REUTERS/Kim Hong-Ji 

Former U.N. secretary-general Ban Ki-moon and his wife Yoo Soon-taek pay a tribute at the natioanl cemetery in Seoul, South Korea, January 13, 2017. REUTERS/Kim Hong-Ji 

Former U.N. secretary-general Ban Ki-moon pays a tribute at the natioanl cemetery in Seoul, South Korea, January 13, 2017. REUTERS/Kim Hong-Ji 

Former U.N. secretary-general Ban Ki-moon leaves after paying a tribute at the natioanl cemetery in Seoul, South Korea, January 13, 2017. REUTERS/Kim Hong-Ji 

Former UN chief Ban Ki-moon kisses a boy upon his arrival at the Incheon International Airport in Incheon, South Korea, January 12, 2017. REUTERS/Kim Hong-Ji