Group 1 - The South Korean Supreme Court overturned a previous not guilty verdict against presidential candidate Lee Jae-myung, sending the case back for retrial [1] - Following the Supreme Court's decision, acting President Han Duck-soo and Economic Vice Minister Choi Sang-mok resigned from their positions [1] - The acting presidency will now be assumed by Education Minister Lee Joo-ho, as Choi Sang-mok also resigned [1] Group 2 - Han Duck-soo officially announced his candidacy for the 21st presidential election during a press conference, emphasizing the need for political reform in South Korea [3] - He proposed three key campaign promises: immediate constitutional amendments, addressing trade issues arising from U.S. tariffs, and national unity [3] - Han plans to draft a constitutional amendment in his first year if elected, complete it in the second year, and hold a presidential election under the new constitution in the third year [3][4]