AKIPRESS.COM - It has been an inauspicious return to crisis-plagued South Korea for former U.N. chief Ban Ki-moon, once the odds-on favorite to be the next president, who has been ensnared in a family corruption scandal and struggled with a skeptical press, reported Reuters.

Ban, 72, has been unable to capitalize on his much-anticipated homecoming after a decade as secretary-general of the United Nations in New York. Since his return on Jan. 12, he has cut a sometimes-irritable figure in public and been pilloried for a series of perceived PR gaffes - all without announcing any intention to run for president.

Now the United States has asked South Korea to arrest his brother, Ban Ki-sang, on charges that he engaged in a bribery scheme to carry out the sale of a Vietnamese building complex.

The timing of the case could hardly be worse for Ban, whose high international profile and clean image were expected to be assets as he returned to a nation reeling from a presidential corruption scandal. President Park Geun-hye has been impeached by parliament and stripped of her powers while a court decides her fate.

Ban Ki-moon apologized on Saturday for family members who had caused public concern. "I have absolutely no knowledge of this case," he said in a statement.

However, a Realmeter poll released on Monday showed Ban's support slipping from 22.2 percent last week to 19.8 percent, compared with 29.1 percent for Moon Jae-in of the opposition Democratic Party.

The poll numbers are volatile and analysts say it is too early to count out Ban. However, if Moon holds his lead, he would become the first liberal to be elected president in nearly a decade.

Ban has yet to affiliate himself with a party but had been expected to run as a conservative.

If the impeachment vote against Park is upheld by the Constitutional Court, she will have to quit and an election would be held two months later. A ruling is expected as soon as next month.

Ban has a team of politicians and former diplomats supporting him and has made several campaign-style appearances around the country since his return, pitching him in the full glare of the media spotlight.