At approximately 10:30 pm on December 3, 2024, South Korean President Yoon Suk-yeol appeared on national television and declared martial law. He cited anti-state forces operating through the parliamentary process and announced the deployment of military units to key government buildings in Seoul. The National Assembly convened an emergency session within the hour. By 1 am on December 4, 180 members had voted to annul the declaration — more than the two-thirds required by the constitution. Yoon reversed course and stood down the military. The entire episode had lasted less than three hours. It was the first declaration of martial law in South Korea since 1980. It was also, in terms of market impact, a remarkably instructive episode in the specific character of Korean political risk and how it actually transmits to financial markets.
The KOSPI fell 2.9% in the immediate aftermath. The won dropped sharply against the dollar. And then markets stabilised. By the time the National Assembly passed the formal impeachment motion against Yoon on December 14, the KOSPI had largely recovered its martial law losses. The full-year KOSPI performance in 2024 was -9.6%, but the bulk of that underperformance had accumulated over the prior months from a combination of semiconductor cycle softness, won weakness against the dollar after Trump's election, and general risk-off positioning — not from the December crisis itself.1
The pattern across three crises
Korea's three presidential impeachment cases — Roh Moo-hyun in 2004, Park Geun-hye in 2016-17, and Yoon Suk-yeol in 2024-25 — provide an unusually rich dataset for analysing how Korean political crises interact with financial markets. The pattern across all three is consistent enough to constitute a framework, even though each crisis had meaningfully different political character.
In the Roh case, the KOSPI fell 14.5% during the impeachment process — the largest market impact of the three episodes. The Constitutional Court subsequently reversed the impeachment, reinstating Roh, which produced a partial recovery. The 2004 crisis occurred against a backdrop of economic uncertainty and a relatively young and shallow domestic institutional investor base that amplified foreign selling pressure. In the Park case, the KOSPI rose 4.48% during the impeachment process — a counterintuitive result explained by the fact that the constitutional resolution of a governance scandal that had been running for months reduced uncertainty rather than creating it, and global equity markets were broadly rising in the post-Trump election period. In the Yoon case, the Constitutional Court's unanimous decision on April 16, 2025 to confirm the impeachment triggered a market relief rally that began the sustained KOSPI ascent through the June 2025 election and beyond.2
The consistent finding across all three episodes is that Korean markets recover quickly from political crises when the constitutional resolution process operates as designed. The Korean constitutional framework — a Constitutional Court that can definitively adjudicate presidential removal, a clear electoral mechanism for replacement, and an independent central bank and financial regulatory system that provides emergency liquidity support — has proven sufficiently robust to contain political shocks without generating the kind of systemic institutional breakdown that creates permanent market impairment. This is not a trivial observation. Many emerging markets that experience comparable executive-branch crises do not have institutional infrastructure capable of the same containment.
In the Park impeachment, the KOSPI rose during the crisis. In the Yoon case, the Constitutional Court's unanimous ruling triggered the beginning of the most sustained KOSPI rally in years. Resolution of political uncertainty, it turns out, is often bullish — if the institutions hold.
Why the pattern holds — and the institutional explanation
The resilience of Korean financial markets to presidential crises is not accidental. It reflects specific features of Korean institutional design that distinguish political volatility at the executive level from institutional breakdown at the systemic level. The distinction is crucial for investors, because it is institutional breakdown — not political drama — that produces the kind of sustained market impairment that cannot be recovered from on a reasonable investment horizon.
The Constitutional Court's track record in Korean impeachment cases demonstrates institutional independence. In the Roh case, it reversed the impeachment on procedural grounds. In the Park case, it confirmed it unanimously. In the Yoon case, it confirmed it unanimously again. Each decision was legally reasoned and constitutionally grounded, and in each case the outcome was accepted by the losing side through the legal and electoral process rather than extra-constitutional resistance. The Bank of Korea's response to the December 2024 crisis — announcing unlimited liquidity support for financial markets within hours of the martial law declaration — demonstrated that the financial regulatory framework operates independently of presidential authority and can respond credibly to acute stress. The credit rating agencies (S&P, Moody's, and Fitch) all affirmed Korea's sovereign ratings in the immediate aftermath of the December 2024 crisis, reflecting the same assessment: political turbulence without institutional breakdown.3
The feature of the Korean system that makes political volatility at the presidential level less financially consequential than it initially appears is the relative weakness of executive authority over the economy compared to most peer countries. Korea's corporate sector, financial system, and export competitiveness operate largely through channels — the large export-oriented chaebols, the global semiconductor supply chain, the financial system's relationship with international capital markets — that are not primarily directed by presidential policy. A president who is removed has limited ability to impair these channels. A new government that takes office with a reform mandate can accelerate them. The December 2024 crisis damaged confidence temporarily and created policy vacuum for several months. It did not impair Samsung's ability to manufacture memory chips, alter the fundamentals of the governance reform story, or change the structural valuation gap that defines the Korea Discount.
The December 2024 anomaly and what it revealed
The Yoon martial law episode was more concerning than the subsequent market recovery might suggest, precisely because its catalyst was unlike the prior impeachment cases. Roh was impeached over procedural political disputes. Park was impeached over a corruption scandal that fit within recognisable patterns of chaebol-political entanglement. Yoon deployed troops to the capital in response to parliamentary opposition. The last time that happened in Korea was 1980, under circumstances that ended in massacre. The question the episode raised was not whether Korea's constitutional institutions would respond — they did, within hours — but whether the institutional norms against executive overreach that had developed over four decades of democracy were as deeply embedded as they appeared. The unanimous Constitutional Court ruling and the 79.4% voter turnout in the subsequent election were, in aggregate, a stronger democratic reaffirmation than the original crisis warranted pessimism about. But the precedent has been set, and the next leader who finds parliament obstructive will know that the attempt was made.4
For investors, the actionable lesson from December 2024 is not that Korean political risk is negligible. It is that Korean political risk is short-duration. The shocks are sharp and the recoveries are comparably sharp, driven by the institutional containment of the crisis and then by the fundamental factors that were present before it. Investors who sold Korean equities in December 2024 and waited for clarity missed one of the strongest equity rallies of 2025. Investors who used the political dislocation as a buying opportunity captured the initial phase of a re-rating that subsequently drove the KOSPI to all-time highs.
North Korea: the permanent discount
No discussion of Korean political risk is complete without the variable that cannot be measured, modelled, or diversified away: North Korea. The security situation on the peninsula has been the single most persistent contributor to the structural geopolitical risk premium embedded in Korean equity valuations by international investors. It manifests primarily in allocation model constraints — many institutional mandates classify Korean equities as subject to elevated geopolitical risk that limits position sizing regardless of fundamental valuation — rather than in active tactical selling during specific provocations.
The North Korea risk has a specific character that differs from most political risks: it is permanently elevated but rarely escalates to the point of triggering the tail scenario that the risk premium is priced to reflect. Periodic weapons tests, missile launches over Japan, naval provocations in the West Sea — these occur regularly and produce episodic market reactions that have historically been short-lived. The scenario that would produce sustained market impairment — kinetic conflict on the peninsula — has not occurred in seventy years despite continuous provocation cycles. The risk premium has therefore been chronically overpriced relative to the realised frequency of the event it is meant to compensate for, which is part of why the Korea Discount has persisted even when corporate fundamentals would argue against it.5
Whether the current geopolitical context changes this assessment is a legitimate question. The Trump administration's stated willingness to engage directly with North Korea — treating it as a nuclear power rather than pursuing denuclearisation as a prerequisite for dialogue — introduces new variables into the peninsula's security calculus. An arrangement that reduces Korean tension on the security dimension, even at the cost of implicitly legitimising North Korea's nuclear status, could structurally reduce the geopolitical risk premium in Korean equities to a degree that no corporate governance reform can achieve. This is speculative, and the diplomatic trajectory is genuinely uncertain. But it is worth including in any comprehensive framework for Korean political risk, because it represents a potential upside scenario that most institutional models do not currently price.
The framework for ongoing assessment
The five essays in this Korea series have traced the anatomy of a structural anomaly — the Korea Discount — through its causes, its political economy, its semiconductor dimensions, its demographic context, and its political risk profile. The through-line is a country whose corporate sector has been systematically valued below its intrinsic worth for structural reasons that are now, for the first time, being addressed by a government with the legislative mandate and the institutional control to make the changes stick.
That is not a guarantee of success. Korea's reform history is a catalogue of initiatives that faltered at implementation. The chaebol lobby has not accepted defeat. The demographic problem has no near-term solution. The semiconductor geopolitical tension will not resolve cleanly. Political volatility will recur — the polarisation of Korean politics has structural roots that Lee's current parliamentary supermajority does not eliminate.
What is different now, and what sustains the investment thesis, is the combination of three things that have not previously coincided: legislative reform that is structurally meaningful, not merely cosmetic; a corporate behaviour shift that is producing measurable changes in shareholder returns even ahead of full enforcement; and a market re-rating that, despite the 2025 rally, still leaves Korean equities trading at a meaningful discount to developed market and even emerging market peers on fundamental valuation metrics. The Korea Discount has narrowed. The investment case remains.