The Democratic Party of Korea enters the June 3, 2026, parliamentary by-elections holding a commanding position, with traders assigning an 83 percent implied probability to the party capturing 10 or more of the roughly 14 contested National Assembly seats. This outlook stems from President Lee Jae-myung’s sustained approval ratings near 60 percent and the DP’s broad lead in national polling ahead of the concurrent nationwide local elections. Many vacancies arose after sitting lawmakers resigned to contest governorships or mayoral posts, creating opportunities in both traditional DP strongholds and competitive districts such as Busan and Daegu. The main opposition People Power Party continues to trail in voter sentiment following the prior year’s political turbulence, while DP campaign messaging centers on consolidating control of national institutions. No major last-minute shifts have altered the projected margin, leaving the 8-9 seat range as the primary alternative outcome at 12 percent.