A second South Korean minister has resigned for playing golf on the first day of a national rail strike.
Former Prime Minister Lee Hae-chan resigned on Tuesday
Lee Gi-woo, Education Vice-Minister, resigned a day after Prime Minister Lee Hae-chan announced he was quitting.
The PM was criticised by opponents and newspapers for not overseeing the government's response to the strike, on 1 March, an important national holiday.
Both ministers were playing golf with local businessmen, one of whom had a criminal record.
Critics say the businessmen were seeking favours, and that some were under investigation for irregularities.
Prosecutors say they are launching a criminal investigation into the affair and will question key figures next week, Yonhap news agency reported.
The opposition Grand National Party hopes public anger over the incident will damage the chances of the ruling Uri party in local elections in May.