2026 Seoul Mayoral Election Winner prediction

The tell-tale sign in this race isn't that Chong Won-oh is ahead — it's that he's pulling further ahead with nowhere near enough runway left for Oh Se-hoon to recover. When a sitting mayor with full name recognition and the incumbent's megaphone can't close the gap in the final week, that's not a blip. That's a verdict. Chong's housing and redevelopment message has cut through in exactly the way Seoul voters respond to. Oh's district blitz looks desperate rather than dominant — the move of a campaign that knows the numbers aren't there. The Daejeon tragedy grabbed headlines and forced both camps to adjust their tone, but it didn't rewrite the fundamentals. Events like that rarely flip a settled urban mayoral race in 48 hours. The only scenarios where this goes wrong involve a polling error so severe it would be historically unusual, or a last-minute collapse in turnout that nobody sees coming. Neither is the base case. Back Chong — the lead is real, the timing is against the incumbent, and smart money doesn't fight momentum this late without a very good reason.