Sri Lanka, June 3 -- South Korean voters headed to the polls to pick a new president, with the two leading candidates vowing to revive an ailing economy and put months of turmoil over a failed martial law attempt in the rearview mirror.

The poll is effectively pitting Liberal front-runner Lee Jae-myung of the Democratic Party (DP) against conservative rival Kim Moon-soo of the governing People Power Party (PPP).

Tuesday has been designated a public holiday, with voting precincts opening at 6 a.m. local time and due to close at 8 p.m, while South Koreans overseas were allowed to vote early from May 20 to 25.

The snap election was triggered by the ouster of Yoon Suk Yeol, who briefly imposed martial law in December, unsettling many South...