South Korea's Local Elections: A Broad Win for the Governing Party, a Loss in Seoul
On June 3, 2026, the Democratic Party of Korea (DPK) won nine parliamentary by-elections, while the People Power Party (PPP) secured four and an independent won one, according to reports from The Sun Malaysia.
Legislative shifts in parliamentary by-elections
The results of the parliamentary by-elections held during the June 3, 2026, local elections indicate a notable shift in legislative composition. The DPK's acquisition of nine seats, compared to the PPP's four, suggests a significant expansion of the opposition's influence within the assembly. This distribution of seats, alongside the election of one independent candidate, creates a legislative terrain that may require more complex coalition-building or negotiation for the sitting administration.
One significant outlier in the by-election results was the performance of Han Dong-hoon. A former justice minister and member of the conservative faction, Han Dong-hoon won a parliamentary by-election in Busan as an independent. This result is noteworthy as it indicates that significant political figures can successfully navigate electoral processes outside the traditional two-party structure. In my analysis, this outcome suggests that individual candidate popularity and regional specificities can occasionally override established party affiliations.
Trends in the Seoul and Busan mayoral races
Exit polls conducted by the Korea Election Pool, which surveyed 108,000 voters across 615 polling stations, suggest a strong performance for the DPK in major metropolitan mayoral races. In Seoul, exit polls showed Chong Won-o (DPK) at 51.4 percent against incumbent Oh Se-hoon (PPP) at 46 percent, The Korea Times. This was further supported by a JTBC forecast that placed Chong Won-o at 53.5 percent, compared to 42.9 percent for Oh Se-hoon. The Korea Times.
A similar trend was observed in Busan, where exit polls placed Chun Jae-soo (DPK) at 50.2 percent, leading the incumbent Park Heong-joon (PPP) who stood at 48.3 percent. The following table summarizes these exit poll leads:
| Race | Position | Candidate (Party) | Exit Poll Result |
|---|---|---|
| Seoul Mayor | Chong Won-o (DPK) | 51.4 percent |
| Seoul Mayor | Oh Se-hoon (PPP) | 46 percent |
| Busan Mayor | Chun Jae-soo (DPK) | 50.2 percent |
| Busan Mayor | Park Heong-joon (PPP) | 48.3 percent |
Exit polls indicated a DPK lead in both the Seoul and Busan mayoral races.
Key Insight
Logistical challenges and administrative failures in Seoul
The administration of the elections in Seoul faced significant logistical challenges. The National Election Commission apologized after 14 Seoul polling stations ran out of ballot papers during the voting process. The shortage of supplies at all stations raised concerns regarding the process.
In response to the shortage, President Lee Jae Myung ordered an investigation into the matter. The President condemned the situation, describing it as "a flaw that is difficult to accept." The investigation aims to determine the cause of the shortage and whether it was a systemic failure or an isolated administrative oversight. This event introduces a layer of scrutiny onto the National Election Commission's operational readiness.
Political leadership and party responses
The election results prompted immediate responses from the leaders of the major political parties. Jang Dong-hyeok, the leader of the PPP, expressed "sincere apologies" for what he described as a "disappointing" result. This reaction follows a series of losses in both parliamentary by-elections and key mayoral races.
One reading of this response is that the PPP leadership is attempting to address internal dissatisfaction by acknowledging the electoral outcome. This may serve to stabilize party unity in the aftermath of losing ground in both the legislature and municipal leadership. Conversely, the DPK's ability to capture significant portions of the exit polls in both Seoul and Busan suggests a level of voter alignment with the party's current platform.
Governance and executive-legislative dynamics
The combination of DPK gains in the National Assembly and their leading position in mayoral races suggests a period of increased legislative scrutiny for the executive branch. With the DPK securing more seats in the by-elections, the ability of the current administration to pass legislation may depend more heavily on consensus-building with the opposition.
Also, the investigation into the Seoul ballot shortage adds an administrative dimension to the post-election period. If the investigation reveals systemic issues within the National Election Commission, it could lead to calls for institutional reform. Such reforms would impact how future elections are managed and how the public perceives the integrity of the electoral infrastructure.
Strategic indicators for policymakers and observers
Policymakers, investors, and regulators should monitor several key indicators to assess the long-term impact of these election results:
- The findings of the Presidential investigation into the Seoul ballot shortages: This will determine whether administrative reforms or changes in electoral leadership are necessary.
- Legislative activity in the National Assembly: The increased presence of DPK members may alter the pace and direction of policy implementation.
- Municipal governance in Seoul and Busan: The actual final results of the mayoral races and the subsequent transition of power in these cities.
Sources: koreatimes.co.kr, thesun.my.