South Korea's main opposition party threatened on Monday to impeach acting president Han Duck-soo if he failed to approve legislation to launch a special counsel investigation into President Yoon Suk Yeol's failed bid to impose martial law.

South Korea's Prime Minister and Acting President Han Duck-soo has been questioned by the police regarding the controversial decision to impose martial law. This investigation follows the impeachment of President Yoon Suk Yeol,

Prime Minister Han Duck-soo, now South Korea's acting president, is a seasoned technocrat with over three decades of experience under five presidents. A Harvard doctorate in economics, he played a key role in the US-South Korea Free Trade Agreement.