Opposition leader Lee Jae-myung was sworn in as South Korea’s next president on Wednesday following a dramatic snap election six months after the country’s previous leader declared martial law and plunged the nation into chaos.

Mr. Lee cruised to victory on Tuesday after his predecessor pitched the country into chaos with a brief declaration of martial law.

South Korean voters are choosing who will succeed former President Yoon Suk Yeol, who was removed from office over his ill-fated imposition of martial law.