πŸ›Politics/POLYMARKET/May 21, 2026
polymarket market
Election result

Will Chong Won-oh win the 2026 Seoul Mayoral Election

PRISM
71.5%
MARKET (PUBLISH)
76.5%
MARKET (SETTLED)
0%
MOVE
-77pp

PRISM detected 5.0pp overconfidence β€” and was right

PRISM flagged overconfidence at 77%. Model estimate: 72%. The correction came through.

PRISM WAS RIGHT+326% return
ISSUED FORECASTMay 21, 2026 at 5:21 AM
MODERATE Β· OVERPRICED+5.0ppPRISM 72% Β· Market 77%
Live view diverged Β· PRISM reclassified to MODERATE with edge now +5.0pp. The issued forecast above is the historical commitment scored on the public ledger.
PRISM
71.5%
VS
MARKET
76.5%
EDGE DETECTED5.0pp
WEAK
MODERATE
STRONG
EXTREME
OUTCOME
NO
FORECAST
MODERATE
DIRECTION
OVERPRICED
CONFIDENCE
LOW
ACCURACY EDGE
+74
PUBLISHED
May 21, 2026
VIEW LIVE PRISM FORECASTSEdge scoring updated every 2h
1

What happened

This market resolved NO on June 3, 2026. PRISM's forecast aligned with the resolved outcome.

β—ˆ

Forecast Tape

4 events
  1. May 13, 10:07 PMPUBLISHED

    Prism 83% vs market 83% β€” NONE FAIR

  2. May 21, 5:21 AMRE-ANALYZED

    Forecast NONE β†’ MODERATE at Prism 72%

  3. May 21, 5:21 AMMARKET MOVED

    Market 83% β†’ 77% (-6pp)

  4. Jun 3, 12:00 AMRESOLVED NO

    Resolved NO. Prism was right. +326% return.

2

What the market believed

MARKET PRICE Β· AT FORECAST TIME
76.5%

The market was pricing this event at 76.5% probability when PRISM generated its forecast. PRISM assessed this was too high β€” the market was overconfident.

3

What PRISM believed

PRISM PROBABILITY
71.5%
EDGE DETECTED
5.0pp
FORECAST
MODERATE OVERPRICED
Confidence
LOW
Kelly Reference
N/A
PRISM Sizing (ΒΌ Kelly Β· cap 5%)
N/A
PRISM REASONING
  • β–ΈProbability estimate: 77%
  • β–ΈA tight race with a small polling edge and efficient, high-volume market suggests Chong is a modest but real favorite
FACTORS FOR
  • +Recent Metrix poll shows Chong slightly ahead of Oh
  • +Media characterize race as tight but competitive for opposition
FACTORS AGAINST
  • βˆ’Incumbency advantage for Oh Se-hoon
  • βˆ’Single recent poll within margin of error, many undecided
RESOLUTION PATHS MODELED
Chong wins clear plurality in initial count70%
Chong prevails after close recount or legal review7%
Evidence 55%
SOURCES (11)
last day
  • Campaign officially begins for June 3 elections with 7,800 candidateskoreatimes.co.kr

    According to the National Election Commission, as of Wednesday, 7,829 people registered as candidates, of whom 7,820 remain in the race. Voters will elect 16 ...

  • Jung Won-oh Launches Campaign, Predicts Tight Seoul Mayoral ...en.sedaily.com

    Democratic Party Seoul mayoral candidate Jung Won-oh launched his official campaign at the East Seoul Mail Center, predicting a tight race against People ...

  • Official campaigning for June 3 local elections beginskoreajoongangdaily.joins.com

    Democratic Party Seoul mayoral candidate Chong Won-o experiences delivery work at the East Seoul Mail Center in Gwangjin-gu, Seoul, after official ...

  • Jung Chung-rae kicks off campaign in Seoul, courts Chungcheong ...biz.chosun.com

    Jung Chung-rae of the Democratic Party of Korea visited Seoul's Dongjak District on the morning of the 21st, when the official campaign kicked off, ...

  • On the 21st, when the campaign for the June 3 local elections and ...mk.co.kr

    Starting with Seoul, Chung Chung-rae will visit Seongnam in Gyeonggi Province, Gongju in South Chungcheong Province, Daejeon and Cheonan in order to carry out ...

  • Jung at Post Center, Oh at Garak Market... Seoul Mayor Candidates ...asiae.co.kr

    As the official campaign period for the 9th nationwide local elections began at midnight on the 21st, both the ruling and opposition party candidates.

  • Campaign officially begins for June 3 elections with 7,800 candidateskoreatimes.co.kr

    Ruling, opposition blocs enter 2-week race amid tightening polls in key cities. Chong Won-o, ...

  • Fact check debunks Chong Won-o claim of zero Seongdong ...biz.chosun.com

    On the 19th, Democratic Party of Korea Seoul mayoral candidate Chong Won-o said at the third election committee meeting that "for the past five years ...

  • Jung at Post Center, Oh at Garak Market... Seoul Mayor Candidates ...asiae.co.kr

    As the official campaign period for the 9th nationwide local elections began at midnight on the 21st, both the ruling and opposition party candidates.

  • Jung Wono Kicks Off Campaign at Dong Seoul Post Centerasiae.co.kr

    Sorting Parcels with Representative Chung Cheongrae. Jung Wono, the Democratic Party's candidate for Seoul mayor, began his 13-day election journey at the Dong ...

  • Rival parties gear up for official campaigns set to begin Thursdaykoreajoongangdaily.joins.com

    The ruling Democratic Party (DP) and the main opposition People Power Party (PPP) geared up Wednesday for the June 3 local elections and parliamentary ...

PRISM RETRIEVES EVIDENCE FROM A CURATED LIST OF PRIMARY WIRES + OFFICIAL SOURCES

4

Why the gap existed

Prism correctly identified 5.0% mispricing

CALIBRATION SCORECARD
PRISM ACCURACY
0.511
MARKET ACCURACY
0.585
EDGE
+73.9
Brier edge
PRISM's probability estimate was more accurate than the market price.
5

How this forecast played out

1.PRISM analyzed Will Chong Won-oh win the 2026 Seoul Mayoral Election, classifying it as overpriced at 76.5%.
2.Forecast classification: MODERATE OVERPRICED β€” PRISM estimate 71.5% vs market 76.5%.
3.Kelly reference at forecast time: β€”% (ΒΌ Kelly, capped at 5%; mathematical reference only β€” not a position recommendation).
4.Outcome: resolved NO.

Get live PRISM forecasts for Kalshi + Polymarket.

Edge scores, Kelly references, confidence levels, and resolution paths β€” updated every 2 hours, before the market corrects.

VIEW LIVE FORECASTS
PRISM: v0.9.139-kalshi-fetch-hardeningΒ·Forecasted: May 21, 2026Β·Resolved: June 3, 2026Β·polymarket
For informational purposes only. Not financial advice. EdgeCal provides PRISM-generated market analysis and does not execute trades, manage funds, or guarantee returns. Past performance does not indicate future results.