If Mr. Yoon quits or is removed from office then, under the constitution, Prime Minister Han Duck-soo will step in to perform presidential duties.
Mr. Yoon, a conservative, came into office after winning the 2022 presidential election by a threadbare margin, and appointed Mr. Han as the prime minister that year. It marked Mr. Han’s second time in that job; he had served under President Roh Moo-hyun, a liberal, from April 2007 to February 2008.
Mr. Han began his career as a civil servant in the early 1970s, working on trade and industrial policy for decades. He received a doctorate in economics from Harvard in 1984. From 2009 to 2012, Mr. Han was South Korea’s ambassador to the United States.
Mr. Yoon has been in a bitter standoff with the opposition, led by the progressive Democratic Party, for almost his entire tenure as president. The Democratic Party inflicted a crushing defeat on his People Power Party in the parliamentary elections held in April, leaving him on the verge of being a lame duck.