Why was the 2020 legislative election significant in South Korean democratic history?

The 2020 legislative election was a significant milestone in South Korean democratic history for several reasons:

• High Voter Participation: The election saw a voter turnout exceeding 66 percent, which marked the highest level of participation in a South Korean legislative election in nearly three decades.1
• Historic Legislative Majority: The Democratic coalition led by President Moon Jae-In secured 180 of the 300 available legislative seats. This result represented the largest legislative majority achieved by any party since South Korea’s transition to democracy in 1987.1
• Context of Crisis Management: The election was widely viewed as the first nationwide vote of the COVID-19 era. The administration’s effective mobilization of the country's public health apparatus to combat the pandemic served as the central focus of the Democratic Party's campaign, ultimately providing a substantial boost to Moon's popularity and securing his midterm victory.1