The impeachment of Han Duck-soo, acting president since Yoon was impeached on Dec. 14 for declaring martial law, has thrown South Korea's once-vibrant democratic success story into uncharted territory.

South Korea's main opposition party introduced a bill to impeach acting President Han Duck-soo on Thursday, a day before it plans to seek a vote on the move, which could deepen a constitutional crisis triggered by a short-lived martial law.

The country has passed the U.N. threshold of a "super-aged society," with one in five of the population now aged over 65.

Han has been the caretaker leader after President Yoon Suk Yeol was impeached by the assembly over his short-lived imposition of martial law earlier this month.

NBC News investigates health insurance companies denying cancer patients coverage for potentially life-saving treatments. South Korea’s interim president is impeached just two weeks after the ouster of the country’s former leader. And a small Tennessee town is still in recovery mode after Hurricane Helene.

South Korea’s opposition-controlled National Assembly has voted to impeach the country’s acting leader Han Duck-soo. The assembly approved the impeachment motion in a 192-0 vote. Han’s impeachment further deepens South Korea’s political crisis and damages its international image.

The passenger-flight accident occured during landing as the aircraft veered off a runway and collided with a fence.

The National Fire Agency said the fire was almost put out but officials were still trying to pull people from the Jeju Air passenger plane at the airport in the southern city of Muan.

SEOUL, South Korea -- South Korea’s opposition-controlled National Assembly voted Friday to impeach acting President Han Duck-soo despite vehement protests by governing party lawmakers, further deepening the country’s political crisis set off by President Yoon Suk Yeol’s stunning imposition of martial law and ensuing impeachment.

South Korea has voted to impeach its acting president Han Duck-soo, two weeks after parliament voted to impeach its President Yoon Suk Yeol. A total of 192 lawmakers voted for his impeachment, more than the 151 votes needed for it to succeed.

South Korea's National Assembly impeached the country's acting president, Han Duck-soo, on Friday, marking the second time in December that it has chosen to remove the country's leader.