Prime Minister Han Duck-soo, who became South Korea's acting president after Yoon Suk Yeol's impeachment, is a career technocrat whose wide-ranging experience and reputation for rationality may not be enough to stem the country's deepening political crisis.

The country’s opposition has accused acting president Han Duck-soo of obstructing justice and aiding the failed martial law bid.

South Korea's opposition said on Thursday it had filed an impeachment motion against acting leader Han Duck-soo, in an escalating row over the composition of the Constitutional Court that would decide whether to remove his predecessor from office.