Scuffles erupted at the National Assembly's main hall as lawmakers from the conservative Liberty Korea Party occupied the speaker's podium to block the vote on the election law. Speaker Moon Hee-sang exercised his power to restore order and mobilized security guards to control the protesting lawmakers.

Moon managed to put the bill to a vote in which a total of 167 lawmakers, just more than half, took part. It received 156 votes in favor, while 10 members opposed it and one abstained.

Moon introduced the motion during a previous extra session on Monday but the LKP blocked it with a filibuster. Under parliamentary rules, the party could not use such obstructive tactics with the same bill on Friday.

Under the revised law, which will come into effect for April parliamentary elections, the number of directly elected seats and proportional representation slots will be unchanged at 253 and 47 in the 300-member National Assembly.

But the method of distribution of PR seats will be changed to better reflect the vote share and boost the presence of minor parties, which have largely been underrepresented in the current scheme.

The new law also includes lowering the legal voting age to 18 from 19.

The LKP denounced the ruling party-led revision, which is expected to sharply decrease the two major parties 'PR seats.

LKP floor leader Shim Jae-chul reaffirmed the party will push for a constitutional appeal to nullify the passage of the "monstrous" electoral bill.

The party also said that it will start work soon to launch a new small satellite party aimed at garnering PR seats in the upcoming elections.

Following the vote, Speaker Moon also put another contentious bill on the agenda.

This bill calls for establishing a separate unit to probe corruption by high-ranking public officials as part of the Moon Jae-in administration's efforts to reform the prosecution.

The LKP had threatened to block the bill through a filibuster. (Yonhap)