Millions of South Korean voters are casting their ballots on Tuesday for a new president in a snap election following the ouster of former President Yoon Suk Yeol.

Yoon, a conservative, faces trial on rebellion charges over his short-lived martial law declaration in December.

Pre-election surveys suggested Lee Jae-myung, Yoon’s liberal archrival, appeared poised to coast to victory due to public frustration over the conservatives in the wake of Yoon’s martial law decree.

The main conservative candidate, Kim Moon Soo, has struggled to win over moderate swing voters, as his People Power Party grapples with internal feuding over how to view Yoon’s actions.

Kim Moon Soo, presidential candidate with the People Power Party, holds an election campaign rally in Seoul, South Korea, late Monday, June 2, 2025. (AP)

As of 2 p.m. local time, more than 13 million people had cast their ballots. Roughly 15 million also voted during last week’s two-day early voting period, meaning voter turnout stood at 65.5%. South Korea has 44.4 million eligible voters.

On Tuesday, Lee, whose Democratic Party led the legislative effort to oust Yoon, urged voters to “deliver a stern and resolute judgement” against the conservatives over Yoon’s martial law declaration.

In one of his final campaign speeches on Monday, Lee argued that a victory by Kim would represent “the return of the rebellion forces, the destruction of democracy and the deprival of people’s human rights.” He also vowed to revitalize the economy, reduce inequality and ease national divisions.

A woman casts her vote for the presidential election at a polling station in Seoul, South Korea, Tuesday, June 3, 2025. (AP)

Kim, a former labor minister under Yoon, warned that a win by Lee would allow him to hold excessive power, launch political retaliation against opponents and legislate laws to protect him from various legal troubles, as his party already has control of parliament.

Lee “is now trying to seize all power in South Korea and establish a Hitler-like dictatorship,” Kim said at a rally in the southeastern city of Busan.

The Associated Press contributed to this report.