Tools chosen: polymarket_direct claude_news gdelt_news wikipedia polymarket_related kalshi_related code_execution

Sub-questions (Fermi decomposition)

Planner reasoning

Lee Jae-myung became President of South Korea in June 2025, and Article 84 of the ROK Constitution grants sitting presidents immunity from criminal prosecution except for insurrection or treason; his ongoing trials have been suspended. So the base rate for arrest before end-2026 is very low, and the key research is confirming immunity status, trial suspension, any impeachment/insurrection-related exposure, and the current market price.

# Current state Lee Jae-myung is South Korea's sitting president (since June 2025). All five pending criminal cases against him (election law violation, Daejang-dong, Ssangbangwool, Wirye New Town, related indictments) have been suspended under Article 84 presidential immunity, which bars criminal prosecution during his term except for insurrection or treason. No active arrest warrant exists against him as president; impeachment efforts exist but face a near-impossible constitutional threshold given his party's Assembly majority. # Timeline of key events - 2023-09: Prosecutors sought arrest warrant against then-opposition leader Lee on corruption charges; National Assembly rejected it (confirmed, pre-presidency). - 2024-11: Lee convicted under Public Official Election Act for false statements during 2022 campaign (confirmed, pre-presidency). - 2024-12 to 2025-04: Yoon Suk Yeol impeached and removed over martial law declaration (confirmed) — precedent for South Korean political volatility but not directly relevant to Lee's immunity. - 2025-06: Lee elected president in snap election following Yoon's removal (confirmed). - ~2025 (late)–2026 (early): Lee's five criminal trials progressively suspended, culminating in suspension of the last active case (Ssangbangwool/North Korea remittances) (confirmed — Korea Herald). - Date unspecified (post-suspension): Constitutional complaints filed challenging whether Article 84 immunity extends to trials that began pre-presidency; Seoul Central District Court and Seoul High Court ruled immunity covers all judicial proceedings, not just indictment (confirmed — Korea Herald). - 2026-06-28/29: National Assembly public petition demanding Lee's impeachment surpasses 100,000 signatures within two days, triggering committee referral threshold (confirmed signature count; impeachment outcome not reported as advancing) (Korea Herald). - 2026-06 (Kyunghyang): Ruling-party-aligned "Prosecution Future Committee" reframes original corruption cases as alleged prosecutorial fabrication rather than pursuing them (reported). - 2026-07 to 2026-08: Extensive news coverage shows Lee actively conducting normal presidential business (diplomacy, AI/chip investment deals, foreign summits) — no legal jeopardy signals (confirmed via GDELT, routine coverage). # Event Will Lee Jae-myung be arrested or detained by law enforcement before December 31, 2026? # Outcomes to forecast - Yes (arrested/detained) - No (not arrested/detained) # Kalshi market anchor No direct Kalshi YES price was returned in this research pull for the event's own ticker. The closest Kalshi proxy is a related market, **"Will South Korean President Lee Jae-myung serve their full term?"** (KXFULLTERMSKPRES-29): currently 53% Yes (down sharply from 30-day range high of 93.2%, low 5.8%; -31pts over 30 days, -4pts over 7 days; thin volume ~213 contracts/day). This reflects broad political/tenure risk, not specifically arrest — but a falling "full term" probability suggests rising perceived instability, which could modestly correlate with arrest risk. **Polymarket direct price for this exact question is 8.35%** (down slightly, -1.3% 7d, -1.1% 30d; $530k volume over 90 days; range 6.85%–12.55%). Treat Polymarket as the primary anchor in absence of direct Kalshi data. # Sub-question answers 1. **Polymarket price/trend** — 8.35% current, declining slightly over 7d/30d, range 6.85–12.55% over 90 days, $530k total volume (Polymarket direct). 2. **Immunity status** — Lee holds the presidency; Article 84 bars criminal prosecution during tenure except insurrection/treason; no insurrection/treason charges are alleged against him (Korea Herald, Wikipedia). 3. **Trial status** — All five pending criminal cases (election law, Daejang-dong, Ssangbangwool, Wirye) are suspended, not dismissed, due to Article 84; courts have ruled immunity extends to pre-presidency-initiated proceedings, rejecting constitutional complaints challenging this (Korea Herald). 4. **Impeachment/crisis risk** — A public petition surpassed 100,000 signatures (June 2026) but impeachment requires 200/300 Assembly votes; DP's majority makes this "unlikely" per Korea Herald. No confirmed active impeachment motion is proceeding. 5. **Recent prosecutorial/court steps (last 90 days)** — No new arrest-warrant efforts against sitting president Lee reported. Ruling-party allies are investigating prior prosecutors, not advancing cases against Lee (Kyunghyang Shinmun, June 2026). 6. **Historical base rate** — Yoon Suk Yeol was impeached/removed (Dec 2024–Apr 2025) after martial law declaration, later reportedly detained as a former president post-removal — but that required impeachment/removal first, an extraordinary circumstance (martial law). No South Korean sitting president has been arrested/detained while still holding office and immune under Article 84; Yoon's case is the nearest precedent and required prior removal from office. # Key facts (high-confidence, factual) 1. [Korea Herald] All five criminal cases against Lee are suspended under Article 84 immunity as of the last reporting. 2. [Korea Herald] Courts have twice upheld immunity's applicability to pre-presidency-initiated trials, rejecting challenges. 3. [Korea Herald] Impeachment petition crossed 100,000 signatures (June 2026) but faces a 200-vote Assembly threshold DP's majority blocks. 4. [Polymarket] Market prices arrest probability at 8.35%, trending slightly down. 5. [Kalshi related] "Full term" market fell from ~93% to 53% over 30 days — signals rising general instability perception, unclear direct linkage to arrest. # Cross-market signals - Kalshi related: KXFULLTERMSKPRES-29 "serve full term" Yes at 53%, sharp 30-day decline (-31pts) — indicates growing doubt about Lee completing term, though this covers resignation/removal/death, not just arrest. - Polymarket: 8.35% Yes on the identical arrest question, slight downward drift, moderate volume ($530k/90d). - No sportsbook data available. # Analyst opinions and speculation - Korea Herald: current legal/political landscape shows "no visible legal pathway to Lee's arrest before 2027" absent an insurrection/treason charge or Constitutional Court reversal of immunity — neither imminent. - Code-execution hazard modeling: market prices of 8-10% would imply monthly hazard rates (~0.64-0.81%) exceeding even "high" scenario assumptions, suggesting Polymarket's 8.35% may be pricing in tail/catalyst risk beyond current visible evidence — a possible overpricing relative to fundamentals, though political volatility (impeachment petitions, sharp drop in "full term" Kalshi market) could justify elevated pricing. # Directional lean per outcome - **Yes (arrested)**: Weak support — only from generalized instability signals (falling "full term" Kalshi price, impeachment petition momentum) and irreducible tail risk in South Korea's volatile political history (c.f. Yoon precedent, martial law crisis). No concrete warrant, charge, or proceeding currently targets Lee for arrest. - **No (not arrested)**: Strong support — Article 84 immunity actively shields Lee, courts have upheld it against challenges, no active arrest warrant, impeachment structurally near-impossible given DP majority, ruling party is protecting rather than prosecuting him. # Gaps / unknowns - No direct Kalshi YES price for this exact ticker was retrieved — anchor uses Polymarket instead; true Kalshi consensus unknown. - Unclear whether Constitutional Court could still rule against the immunity-extension interpretation, which could reopen suspended trials (though trial resumption ≠ arrest). - No visibility into any secret/ongoing insurrection-adjacent investigation that could trigger the immunity exception. # Calibration anchors - Polymarket YES price (primary anchor used): 8.35%, slightly declining. - Kalshi related "full term" market: 53% Yes, down sharply from ~93% a month ago — signals elevated but non-arrest-specific political risk. - Historical precedent: Yoon Suk Yeol needed impeachment/removal via martial-law crisis before any detention scenario arose; no sitting immune president has been arrested in modern South Korean history — suggests base rate well under 10%, likely single digits.

1. Both forecasts converge tightly around 5-6%, essentially anchoring near Polymarket minus a small discount, but neither seriously interrogates why Polymarket sits at 8.35% rather than lower — if the "no visible legal pathway" case is as strong as both argue, the gap between their fundamental analysis (implying <2-3%) and the market anchor (8.35%) deserves more explicit reconciliation or a stated view that the market itself may be mispriced/illiquid. 2. Neither forecast meaningfully addresses the insurrection/treason exception pathway in detail — the brief flags "No visibility into any secret/ongoing insurrection-adjacent investigation" as a genuine unknown, and given Yoon's own martial-law insurrection charges just occurred in the same political system, this tail risk (a new insurrection-adjacent allegation surfacing against Lee, however unlikely) warrants explicit mention rather than being folded into a generic "tail risk" gesture. 3. Both treat the Kalshi "full term" market's sharp decline (93%→53%) as mostly noise/irrelevant to arrest, but a 31-point drop in perceived full-term probability is a large, recent signal of instability that could partially stem from arrest-adjacent scenarios (e.g., health, scandal escalation, crisis) — this deserves more weight or at least a sharper explanation for why it's discounted so heavily. 4. Neither addresses the Constitutional Court risk explicitly as a distinct scenario: if the Constitutional Court reverses the immunity-extension ruling (an unresolved possibility per "Gaps/unknowns"), trials could resume — while the brief notes "trial resumption ≠ arrest," neither forecaster explains why resumed trials wouldn't meaningfully raise arrest probability if a warrant were then sought. 5. Both forecasters land almost identically (5% vs 6%) despite using slightly different reasoning paths, suggesting anchoring convergence rather than independent triangulation — given the wide uncertainty band in the evidence (Polymarket range 6.85%-12.55%, Kalshi full-term swinging from 5.8% to 93.2%), a tighter clustering at the low end of Polymarket's range without more differentiation may understate genuine tail uncertainty in a volatile political environment (cf. Yoon precedent occurring within the same 18-month window). 6. Neither forecast explicitly weighs the base-rate lesson from Yoon's case — that South Korean political crises can escalate from "impeachment structurally near-impossible" to actual removal and detention within a matter of months when a triggering event (like martial law) occurs — meaning the "near-impossible" impeachment framing may be overconfident given how quickly the prior president's situation deteriorated.

6% (73% confidence)

Yes: 6% No: 94%

Article 84 immunity actively shields Lee: all five criminal cases are suspended, two courts have upheld immunity's extension to pre-presidency proceedings, no warrant or new prosecutorial step targets him, and his party's Assembly majority blocks the 200-vote impeachment threshold that would be a prerequisite for any Yoon-style detention. Fundamentals arguably imply 2-3%, but the red team is right that the Yoon precedent shows South Korean crises can escalate from 'structurally impossible' to removal-and-detention within months, and there is genuine opacity around insurrection/treason-exception or Constitutional Court reversal pathways — plus the sharp Kalshi 'full term' decline (93%→53%) signals real tenure instability that could partially overlap arrest-adjacent scenarios. I therefore do not shade far below the direct Polymarket anchor (8.35%, slightly declining, decent $530k volume), settling just under it at 6% to reflect both the strong structural No case and the short remaining window (only months to end-2026) balanced against irreducible political tail risk. This lands between the two forecasts while explicitly crediting the critique's tail-risk concerns rather than compressing toward the low end.

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