South Korea's political landscape has been thrust into uncertainty following the Dec. 14 impeachment of President Yoon Suk Yeol by the National Assembly, which voted 204-85 to suspend him over his failed Dec. 3-4 martial law attempt. Prime Minister Han Duck-soo has assumed the role of acting president while the Constitutional Court deliberates Yoon's fate, a process that could take up to six months. The impeachment has further polarized South Korea's political environment, complicating its economic and foreign policy direction.

Events Leading to Impeachment

Yoon declared martial law on Dec. 3, alleging opposition lawmakers were collaborating with North Korea to undermine the government. His actions, which included ordering the military to use force against the legislature and arrest opposition leaders, were met with widespread protests and military insubordination, leading Yoon to rescind the declaration within six hours.

The impeachment vote saw bipartisan support, with at least 12 lawmakers from Yoon's ruling People Power Party (PPP) breaking ranks. Since then, Yoon has resisted cooperation with investigations and vowed to continue his political fight, while PPP leader Han Dong-hoon resigned after controversially calling for Yoon’s impeachment.

The Path Forward: Constitutional Court and Early Elections

The Constitutional Court must unanimously confirm Yoon’s impeachment, a high threshold that introduces uncertainty. While the legal case against Yoon is strong, the court’s six judges include at least two aligned with Yoon, and competing investigations into his actions risk complicating proceedings. If the impeachment is upheld, South Korea will hold a presidential election within 60 days, with opposition Democratic Party (DP) leader Lee Jae-myung emerging as a likely candidate. Should the court reject the impeachment, Yoon will resume his presidency, potentially exacerbating political volatility.

Implications of a Confirmed Impeachment

If Yoon is permanently removed, South Korea is likely to see a shift in policy under a DP-led government. Domestically, this would include:

• Pro-Labor and Social Policies: A DP president would prioritize empowering unions, expanding social services, and improving housing access through rent controls and affordable housing initiatives.

• Economic Reorientation: The DP would slow South Korea's participation in U.S.-led semiconductor restrictions on China, focusing instead on improving trade ties with Beijing while reducing reliance on the West. This approach could strain South Korea’s relations with the United States and Japan.

Foreign policy would shift significantly, with the DP likely easing tensions with North Korea through dialogue and humanitarian aid. This contrasts with Yoon’s maximum-pressure approach. Relations with Japan would likely deteriorate as the DP revives historical grievances, while arms exports and nuclear reactor projects championed by Yoon would take a backseat.

Risks if Impeachment is Rejected

Should the court fail to confirm the impeachment, Yoon would likely double down on his conservative agenda, including:

• Crackdowns on Unions: Intensifying measures against labor strikes, which could lead to widespread industrial disruption.

• Military Escalations: Continuing aggressive policies toward North Korea, increasing the risk of border clashes.

• Policy Gridlock: Yoon would use his veto power to block opposition legislation, while DP lawmakers would likely retaliate with renewed impeachment efforts, exacerbating political stalemates.

Street protests and strikes would intensify, further straining South Korea’s governance and economy.

Challenges for Acting President Han Duck-soo

As acting president, Han faces the daunting task of managing domestic and foreign policy amid political turbulence. Key challenges include:

1. Balancing Political Pressures: Han must navigate demands from both the PPP and DP. The PPP expects him to veto opposition legislation, while the DP could seek his impeachment if he appears overly partisan.

2. Maintaining Stability: Han must address critical issues, such as ongoing doctors’ strikes in Seoul, while preparing for potential U.S. trade actions under incoming President Donald Trump.

3. Diplomatic Relations: Han will need to sustain security cooperation with Japan and the United States despite transitions in leadership, all while managing domestic opposition to these alliances.

Han’s technocratic background provides him with the skills to manage these challenges, but his interim status limits his ability to implement long-term solutions.

Outlook

South Korea's political trajectory remains uncertain. If Yoon is impeached, a new administration will likely pivot toward progressive domestic policies and softer foreign relations. If the court rejects the impeachment, Yoon’s return will deepen divisions, amplify protests, and risk economic stagnation. Acting President Han’s tenure, though temporary, will play a pivotal role in navigating this precarious period.