Conservative South Korean opposition candidate Yoon Suk-yeol rode to victory in the country's tight presidential election on a wave of discontent over economic policy, scandals, and gender wars, reshaping the political future of Asia's fourth-largest economy.

His victory in Wednesday's bitterly fought election means a remarkable turnaround for the main conservative bloc, now known as the People Power Party, which had been struggling to regroup since the 2017 snap election was held after the impeachment and ouster of then President Park Geun-hye.

Yoon has pledged to...