Millions of South Koreans are casting their ballots in a snap election triggered by the impeachment of former President Yoon Suk Yeol, following his failed martial law attempt in December.

Opposition leader Lee Jae-myung is leading in the polls, while ruling party candidate Kim Moon-soo, a former Yoon cabinet member, is trailing, BBC reported.

The next president will inherit a divided country, mounting economic worry over US tariffs, and a volatile ally in President Donald Trump.

Polls close at 8:00 p.m. local time (11:00 GMT), with results expected within hours, according to BBC.