Rival parties once again failed Thursday to agree on redrawing electoral districts for next year's general elections.

Ruling Saenuri Party Chairman Kim Moo-sung, main opposition New Politics Alliance for Democracy Chairman Moon Jae-in and the parties' floor leaders sat together over the demarcation of constituencies earlier in the day, but the meeting fell through without an outcome, according to party officials. 

It was their seventh negotiation held on the issue this month as the parties gear up for next year's parliamentary elections set for April 13. 

Delay in the negotiations could deal a blow to parties' candidate register and election campaign as the current electoral map becomes invalid at the end of the year. 

The party leaders will resume their negotiations on Sunday, according to the officials.

The deal breaker was the parties' differences on how to elect proportional representatives, with the ruling party pushing for a reduction in the number of proportional representation seats. 

A revision to push down the minimum voter age to 18 from the current 19 was also discussed, but Kim rejected it, citing concerns of politicization of high-school students. (Yonhap)