South Korean President Yoon Suk Yeol's surprise declaration of martial law, swiftly overturned by the National Assembly, has sparked widespread calls for his resignation or impeachment. Opposition parties have formally initiated impeachment proceedings, citing the unconstitutional act and its implications for democracy. Large-scale protests are planned across major cities, reflecting strong public opposition. The president's plummeting approval ratings and ongoing scandals further fuel these calls for accountability. The incident has also strained South Korea's relationships with the U.S. and other allies.