South Korea’s main opposition party said Tuesday it will seek to impeach acting leader Han Duck-soo after he missed an opposition-set deadline to approve independent investigations into impeached President Yoon Suk Yeol and his wife. If realized, Han’s impeachment would further deepen South Korea’s political tumult and worries by neighboring countries caused by Yoon’s stunning Dec. 3 martial law declaration and ensuing impeachment. Han, the country’s No. 2 official, has taken over presidential powers and duties since Yoon’s impeachment. If he’s impeached too, the finance minister is next in line.