Multiple senior members of conservative President Yoon Suk-yeol’s administration and the head of his People Power Party (PPP) tendered their resignations on Thursday after vote counts confirmed that the left-wing Democratic Party decisively took over the National Assembly in Wednesday’s midterm election. The Democrats overcame a chaotic campaign season in which leader Lee Jae-myung survived a would-be assassin stabbing him in the neck. The day he was released from the hospital, three members of his party defected, protesting that Lee was running an authoritarian and corrupt “regime” within the party. Lee was in court on Tuesday for a hearing addressing...