After months of political turmoil in South Korea, Lee Jae-myung has won the presidential election by a wide margin. Mr. Lee’s campaign has ridden a wave of anger against former President Yoon Suk Yeol after he tried to impose martial law in December.

Lee Jae-myung will be one of the most powerful presidents in decades in South Korea, but he is taking over during a perilous political atmosphere.

© Jun Michael Park for The New York Times

The new president will be tasked with pulling the nation out of political turmoil and face a polarized country and world.

© Jun Michael Park for The New York Times

The election is a big step toward stabilizing the country. But daunting challenges at home and from abroad await the new leader.

© Jun Michael Park for The New York Times