Seoul Mayoral 2026 — Oh Se-hoon wins

Seoul's June 3, 2026 mayoral by-election has settled—Oh Se-hoon won, and Polymarket's Categorical book on the race resolved his market Yes on June 3. The Polymarket book was the heaviest-traded prediction market view of the race (roughly $6.6M in 24-hour volume around settlement); Kalshi listed the same race as a thinner Categorical field, and it has since settled to the same Oh Se-hoon result.

This workspace now stands as a record of how the books read the race: the settled Polymarket pie preserves the final cross-exchange distribution, the history widget preserves the price trajectory into election day, and the Korea-region context events below remain live—useful for anyone reading the Seoul result as part of the 2027 presidential setup.

Polymarket's settled pie preserves the final distribution on the race; the Kalshi sibling has now settled to the same Oh Se-hoon outcome.

Adjacent context — leaders out and Korea-watch

Polymarket's "next leader out of power before 2027" and Kalshi's "leaders out" event give a broader Northeast-Asia and Korea-region political context—useful for anyone reading the Seoul mayoral as part of the 2027 presidential setup.

• Kalshi settlement confirmed. The Kalshi Categorical settled to the June 3 result, matching the Polymarket winner market—both books resolved on the same leader.
• Cross-book agreement. Both books converged on the same leader into election day; the preserved history widget shows how early and how cleanly the favorite separated from the field.
• The 2027 presidential setup. The live context events—Polymarket's next-leader-out book and Kalshi's leaders-out event—are where the Seoul result feeds forward into Korea's national politics.