President Yoon Suk Yeol Yoon imposed martial law in the middle of the night earlier this month, plunging South Korea into its worst political crisis in decades.

The vote was the second major impeachment in two weeks after President Yoon’s ill-fated martial law bid set off turmoil. The country’s currency has plunged.

South Korea's acting president faces an impeachment vote as the Constitutional Court meets for its first hearing on Friday in the case of President Yoon Suk Yeol, who was impeached and suspended from duties after a short-lived martial law. The effort to ...