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What’s Final Is Final: Supreme Court Rules Appellate Courts Cannot Retry Unappealed Convictions

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When only one side appeals part of a split verdict, the unappealed portion becomes legally final and is off-limits for the appellate court — even if it would be procedurally convenient to bundle everything together. Here are the key points.

Issue

Where a trial court issues a mixed verdict — guilty on one charge, not guilty on another — and only the prosecution appeals the acquittal, can the appellate court revisit and re-sentence the already-final guilty portion?

Facts

  • A had previously been sentenced to one year in prison and five years of electronic monitoring for offenses under the Act on Protection of Juveniles from Sexual Abuse. Following release, A was subject to compliance conditions including a prohibition on drinking to a blood alcohol level of 0.03% or above.
  • On the morning of August 17, 2025, A drank alcohol and was escorted home with a warning. That afternoon, A drank again. Blood alcohol readings were 0.215% at 10:35 AM and 0.243% at 1:18 PM.

Lower Court Decisions

  • The trial court convicted A of the morning drinking offense and sentenced him to eight months in prison. It acquitted A of the afternoon offense, reasoning that even without any additional drinking in the afternoon, A’s blood alcohol level would still have far exceeded 0.03% from the morning’s intake alone. The afternoon reading of 0.243% could not by itself prove a separate, additional violation.
  • A did not appeal the guilty portion. The prosecution appealed only the acquittal.
  • The appellate court disagreed with the trial court’s acquittal, finding that the compliance condition prohibited drinking any additional amount — even on top of an already-elevated blood alcohol level. Because the morning and afternoon offenses were treated as part of a single sentencing unit, the appellate court set aside the entire first-instance verdict and re-sentenced A, arriving at the same eight-month term after weighing his remorse against his repeat offense history and the fact that the offense occurred during a suspended sentence period.

Supreme Court Decision

  • The Supreme Court (Criminal Division 3, presiding Justice Lee Suk-yeon) reversed the appellate decision on April 9, 2026, and remanded to Jeju District Court.
  • The court held that where a trial court issues a split verdict and only one party appeals part of it, the unappealed portion becomes separately final at that point. It is no longer before any court and cannot be revisited.
  • In this case, A did not appeal the guilty portion. That conviction — and the eight-month sentence attached to it — became final the moment only the prosecution’s appeal of the acquittal was lodged.
  • The appellate court’s jurisdiction extended only to the acquitted afternoon offense. It was required to adjudicate that issue in isolation and could not fold the already-final conviction back into a unified sentencing exercise.
  • By re-sentencing A on both charges together, the appellate court exceeded its jurisdiction and misapplied the law governing the scope of appellate review.

Key Takeaways

  • In mixed verdict cases, the unappealed portion of a judgment becomes separately and immediately final. It is severed from the appellate proceedings and cannot be touched.
  • An appellate court’s jurisdiction is defined by what has been appealed — not by what would be procedurally tidy to address together.
  • Even where charges are factually related or would ordinarily be sentenced as a single unit, the finality principle overrides the convenience of unified sentencing when only part of the verdict has been appealed.
  • Defense counsel must carefully assess which portions of a split verdict to appeal — and which to let stand — since unappealed convictions lock in immediately and cannot be revisited even if the prosecution’s appeal of an acquittal succeeds.

Why This Matters

This ruling enforces a strict reading of appellate jurisdiction in Korean criminal procedure, with direct practical consequences for how mixed verdicts are handled on appeal. For prosecutors, it means that winning an appeal on an acquitted charge does not automatically open the door to re-sentencing the defendant on everything. For defense counsel, it highlights both the protection and the risk of leaving a conviction unappealed: the sentence is locked in, but so is the conviction itself. Courts and practitioners alike must map out precisely which portions of a verdict remain live before the appellate court — and treat everything else as settled.

Article: https://www.lawtimes.co.kr/news/articleView.html?idxno=220547

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