South Korean President Roh Moo-hyun has accepted the resignation of a third cabinet member over graft allegations.
Construction and Transportation Minister Kang Dong-suk tendered his resignation on Sunday amid allegations regarding land deals.
Former Finance Minister Lee Hun-jai and Education Minister Lee Ki-jun resigned earlier this year.
Correspondents say President Roh could now find it hard to push through his reformist agenda.
He has also been hit by his ruling Uri party losing its parliamentary majority last week.
Mr Kang was facing allegations that he passed on insider knowledge on land deals to his sister and a school classmate.
The minister and the presidential office have both denied Mr Kang was involved.
A presidential aide said Mr Roh agreed to Mr Kang's resignation because the allegations were affecting his health.