Former UN Secretary-General Ban Ki-moon pictured in 2015. "I feel it is regrettable the situation has troubled many", Ban said while addressing reporters at John F. Kennedy International Airport ahead of his departure for South Korea.

An early presidential election is widely forecast to be held here as President Park Geun-hye was impeached in the National Assembly on December 9 with an overwhelming majority.

Keangnam chairman Sung Wan-jong sought the help of Ban Ki-sang, who was an advisor, and US realtors Colliers International, where Ban Joo-hyun served as director.

Ban said in the televised press conference that he will have opportunities to listen to various public opinions from the next day, noting that he will make a "disinterested" decision.

Ban Ki-moon was not mentioned in the U.S. indictment, however, his arrival to South Korea on Thursday has been clouded by the bribery scandals involving his family members. A spokesperson for the ruling Saenuri Party welcomed the former United Nations chief on Thursday, expressing hopes that he would become a versatile political leader. From there, he will be driven by a passenger vehicle to his residence in southern Seoul.

From next week, Ban will embark on a national tour to take the people-friendly move by communicating with the locals across the country. The former diplomat of Seoul has earlier said that he is willing to "burn his body" for better politics in his country. He said political scandals are commonplace in South Korea.

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Ban said that from Friday onward he would try to reach out to citizens to listen to their voices before deciding whether to throw his hat into the ring.

"He has shown himself to be a master of deceit", Noble said.

Hundreds of thousands of South Koreans took to the streets every Saturday night since the scandal involving the impeached president emerged in late October.

He underlined that the country is in an "overall crisis" because of income disparity and ideological, regional and generational conflicts and called for joint efforts to achieve "national integration", Yonhap news agency said citing Ban's speech he delivered at the Incheon International Airport shortly after return to the country from the United Nations headquarters in New York City.

She noted he had no passport, had lived in the United States for 18 years and had not been back to South Korea since 2002.