Seoul Mayor Race Tests Ruling Party as Oh Se-hoon Misses PPP Nomination Deadline

Seoul’s incumbent mayor Oh Se-hoon, a member of the conservative People Power Party (PPP), again refused to register for his party’s nomination today as the PPP sought to broaden its candidate pool for the Seoul mayoral by-election. With a 6 p.m. deadline looming, Oh had not filed his candidacy, despite the party saying it would accept additional registrations this morning.

Oh previously signaled discontent over the party’s direction after a resolution labeled “No to Yoon Again” appeared on the 9th. He said the best solution would be to launch an early innovative campaign committee, but he said there were no signs of such action. He also reiterated that he intends to participate in the election, and ruled out not running or entering as an independent, at least for now.

In the afternoon, Oh met with party leadership for lunch but said he did not receive a satisfactory reply. He indicated his wish for reform within the party, but framed that as a request rather than a concession, while stressing that he would definitely participate in the election.

The party’s leader, Jang Dong-hyuk, did not state a concrete reform position of his own. Instead, he asked the party’s Ethics Committee to suspend disciplinary discussions until after the local elections, a move that critics say merely delays decisive action and signals ongoing internal discord.

Within the PPP, observers describe the exchanges as largely symbolic, with accusations that the party is talking without delivering. Some lawmakers have pushed back against what they view as persistent pressure on Oh, arguing that the party should either accept his reform demands or prepare to run the election without him.

Why this matters beyond Korea: Seoul is the capital and a major economic and tech hub. The mayor’s leadership shapes urban policy, housing, transportation, and smart-city initiatives that affect business, investment, and technology firms, including many American companies. The outcome of this standoff could influence South Korea’s policy direction ahead of national politics, affecting regulatory certainty, public procurement, and the business climate.

For U.S. readers, the episode signals how internal party dynamics in the ruling camp can affect South Korea’s approach to governance, foreign policy alignment, and economic policy. Washington-watchers pay attention because Seoul’s stability and policy continuity impact supply chains, regional security cooperation, and bilateral trade relations tied to the U.S.-Korea alliance, tech leadership, and regional diplomacy.