Prosecutors raided the home and office of the head of Nonghyup Financial Group as part of an investigation into hiring irregularities at the Financial Supervisory Service.

Kim Yong-hwan, chairman and CEO of Nonghyup Financial Group Inc., has been suspected of asking a senior FSS official to give favors to the son of an Export-Import Bank executive during the watchdog's regular recruitment of employees last year.

But a prosecution official said that Kim himself is not subject to the investigation and the raid of his home and office was part of efforts to substantiate charges against FSS officials. Kim's alleged request was also not believed to be against the law unless bribes were involved, officials said.