Oh Se-hoon's Trial and the Battle for Korea's Conservative Future

The Verdict That Could Redraw Korea’s Political Map

The appeal trial of Seoul Mayor Oh Se-hoon is more than a legal proceeding — it is a mirror reflecting the fractures inside South Korea’s conservative movement and the state of its judiciary. While Oh faces a corruption conviction that could end his political career, the real story unfolds in the gaps between his fast-tracked sentencing and the deliberate delays surrounding the ruling party’s own legal troubles.

Oh’s appeal verdict, expected within months of the first-instance ruling, stands in stark contrast to cases involving top figures of President Lee Jae-myung’s administration. Kim Yong, the chief deputy at the Democratic Party’s research institute and one of the president’s closest confidants, was sentenced in a corruption case to an appeal trial in February 2025 — nearly a year and three months after his initial trial. Eighteen months later, no final verdict has emerged.

Kim Hye-kyung, the president’s wife, faces a similar shadow. Her election law violation case reached a second-instance sentence in May 2025. Under the so-called “6·3·3 principle” — a guideline meant to expedite electoral cases — her appeal should have been resolved within three months. It has been 17 months. No final decision.

And then there is Jeong Jin-sang, the former Democratic Party official who has been indicted since March 2023 for his role in the Daejang-dong scandal and the Seongnam FC controversy. Three years on, he has yet to receive a first-instance verdict. He walks free on bail.

These are not minor discrepancies. They are patterns that Jeong Jeom-sik, the ruling People Power Party’s floor leader, laid bare during a National Assembly session on October 20.

The Judicial Double Standard

Jeong’s criticism cuts to the core of a growing perception: that South Korea’s judiciary operates with two speed limits. When it comes to opposition figures like Oh Se-hoon, the courts move with urgency. When the cases involve allies of the current administration, they stall — sometimes for years.

The implication is direct: the ruling party may be weaponizing delay as a form of political protection. Whether intentional or structural, the outcome is the same — key figures in President Lee’s inner circle avoid the finality of conviction while their opponents face swift punishment.

This asymmetry also raises a constitutional question. The president’s wife, Kim Hye-kyung, does not hold the office of president and therefore is not protected by Article 84 of the Constitution, which grants the sitting president immunity from prosecution. Yet her case lingers unresolved, while Oh Se-hoon’s moves toward finality.

Why This Matters Beyond the Courthouse

Oh Se-hoon is not merely a mayor facing a legal reckoning. He is the standard-bearer of a conservative movement that has struggled to define itself since the fall of the previous administration. A conviction could further erode public trust in the party’s commitment to anti-corruption reform — a theme the conservatives have long used to attack their rivals, only to find themselves on the wrong side of the same equation.

But the larger stakes involve South Korea’s foreign policy, particularly toward China. Oh Se-hoon has taken a hard line on Beijing, advocating for closer alignment with Washington and a tougher posture on trade and security. If he is removed from politics, the conservative movement may lose its most prominent voice on the China question — and be forced to either moderate its stance or search for a new leader willing to carry that banner.

For now, the party looks to figure such as Jeong Jeom-sik, whose public critique of judicial delay signals both a defensive posture and an attempt to reframe the narrative. The strategy is clear: paint the ruling party’s legal troubles as politically motivated while portraying Oh’s case as a victim of overreach.

The Impeachment Shadow

Complicating matters further is the push by Democratic Party lawmakers and their allies in the Jooguk Innovation Party to impeach Supreme Court Chief Justice Choi Hee-dae. Jooguk Innovation unveiled an impeachment motion on October 19, urging the Democratic Party to form a joint task force and convene a unified session. Former party leader Jung Cheong-rae took to social media calling the impeachment “the will of the people.”

Jeong Jeom-sik argued that the timing is suspicious — that the impeachment effort is designed to intimidate the court into delivering favorable outcomes ahead of rulings that could harm the administration. Whether that charge holds water depends on whether Choi Hee-dae’s court is indeed swayed by political pressure. But the mere suggestion adds another layer of uncertainty to a judicial system already under scrutiny.

What Happens Next

If Oh Se-hoon is upheld on appeal, the conservative movement will face a leadership vacuum at a critical moment. His absence would weaken the party’s ability to project strength on issues where he has been most assertive — national security, China policy, and anti-corruption governance.

If the delays in the Kim Yong and Kim Hye-kyung cases continue, the perception of judicial inequality will deepen, potentially fueling public anger that could translate into electoral consequences for the ruling party.

And if the impeachment of Chief Justice Choi proceeds, it could trigger a constitutional crisis that further destabilizes an already tense political environment.

The next six months will determine not only the fate of individual politicians but the direction of South Korea’s conservative movement and its relationship with the judiciary — and, by extension, its strategic posture toward China and the broader region.