Who is Han Duck-soo, South Korea's impeached acting president?

Prime Minister Han Duck-soo was impeached, and Finance Minister Choi Sang-mok became acting president. Han served in various leadership positions for over three decades. The impeachment came amid South Korea's political crisis and President Yoon Suk Yeol's suspension. The Constitutional Court will decide on Yoon's removal, and an election may follow if he is ousted.