Seoul, May 2 -- Choi Sang-mok, South Korea's minister of economy and finance who doubles as deputy prime minister for economic affairs, offered to resign Thursday night ahead of a parliamentary vote on a motion to impeach him.

The finance ministry said in a short message that Choi offered to step down at 10:28 p.m. local time (1328 GMT).

Choi offered his resignation just ahead of the vote in the National Assembly's plenary session on the impeachment motion against him that was submitted by the majority liberal Democratic Party on March 21.

The motion was referred to the National Assembly's legislation and judiciary committee for hearings in early April, before it was reported to the parliamentary plenary session Thursday night.

The vo...