Group 1 - The core viewpoint of the news is that the leadership of the main opposition party in South Korea, the People Power Party, is under pressure to resign due to its refusal to distance itself from former President Yoon Suk-yeol [1][3] - A joint statement from 25 current and former local branch leaders of the People Power Party demands the resignation of party leader Jang Dong-heon, arguing that he should stop leading the party away from public opinion to ensure success in upcoming local elections [1] - Jang Dong-heon's response to the first-instance ruling against Yoon Suk-yeol, expressing regret and emphasizing the presumption of innocence, has sparked strong opposition from former party leader Han Dong-hoon and some party lawmakers [3] Group 2 - The People Power Party is facing a challenging electoral situation for the local elections scheduled for June this year, influenced by the recent martial law controversy and the impeachment of Yoon Suk-yeol [3] - Jang Dong-heon has proposed internal reforms, including a potential name change for the party, in an effort to reshape its image [3]

Group 1 - The core viewpoint of the article is that the leader of the main opposition party in South Korea, the People Power Party, is facing pressure to resign due to his refusal to distance the party from former President Yoon Suk-yeol following a significant court ruling against Yoon [1] - A joint statement was issued by 25 current and former local branch leaders of the People Power Party, demanding the resignation of party leader Jang Dong-heon to prevent the party from deviating from public opinion ahead of local elections [1] - The Seoul Central District Court sentenced former President Yoon Suk-yeol to life imprisonment for his involvement in a rebellion case, which has intensified scrutiny on the party's leadership and electoral prospects [1] Group 2 - Jang Dong-heon expressed regret over the court's ruling and emphasized the principle of presumption of innocence, while also suggesting that those advocating for a split from Yoon should be expelled from the party [1] - The former party leader Han Dong-hoon and several party lawmakers strongly opposed Jang's statements, indicating that the party could only win local elections if Jang resigns [1] - The People Power Party is facing challenges in the upcoming local elections scheduled for June, influenced by the recent controversies surrounding the martial law incident and Yoon's impeachment [1]