Criminal Conduct

A concrete act of commission or omission that satisfies the elements of a crime under criminal law and is unlawful and culpable, realizing a crime.

Criminal Conduct

Overview

Criminal conduct (Beomhaeng, 犯行) refers to human conduct that satisfies the elements of a crime under criminal law, is unlawful, and is recognized as culpable—that is, a concrete act of commission or omission that realizes a crime in reality. In jurisprudence, the substance of a crime is analyzed by dividing it into conduct and actor, and determining the existence and scope of criminal conduct is the starting point for attributing criminal responsibility. In everyday language it is often used simply as shorthand for a criminal act, but in criminal law theory it is used more narrowly in the technical sense of an act of execution distinguished from attempt, preparation, and complicity.

Main Content

Concept and Terminology

The term criminal conduct corresponds to Tat in German criminal law and criminal conduct in Anglo-American law, and denotes the act of execution that the actor has manifested externally. By contrast, a crime is an abstract evaluative concept—conduct that satisfies the elements of a crime—whereas criminal conduct is distinguished as an individual, concrete event that meets that evaluation. Accordingly, if the same elements are satisfied multiple times, in principle several instances of criminal conduct are established; where they are evaluated as a comprehensive single crime, they are treated as one instance of criminal conduct.

Three-Stage Structure of Crime

Continental-law criminal jurisprudence examines whether criminal conduct is established in three stages. The first is conformity to the elements of a crime, which asks whether the conduct falls within a type of conduct prescribed by the Special Part of the criminal law. The second is unlawfulness, which examines whether there are no grounds that negate unlawfulness, such as self-defense, necessity, or justifiable conduct. The third is culpability, which determines whether the actor has the capacity for culpability and the capacity to recognize unlawfulness, and whether there are grounds excluding culpability, such as a mistaken belief in the factual premises of a ground justifying the act. Only after passing all three stages does it become punishable criminal conduct.

Types of Criminal Conduct

Criminal conduct is classified in various ways according to its form. Representative types include crimes of commission, realized by positive action, and crimes of omission, established by failing to perform a certain act; result crimes, which require the occurrence of a result, and conduct crimes, completed by the conduct itself; and instantaneous crimes, which end simultaneously with the occurrence of the result, and state crimes or continuing crimes, in which an unlawful state continues. Status crimes, in which the actor's status is an element of the offense, are further divided into true status crimes and quasi-status crimes, and the distinction between intentional crimes and negligent crimes makes a major difference in sentencing and statutory punishment.

Attempt, Preparation, and Conspiracy

Where criminal conduct reaches the commencement of execution but is not completed, the law of attempt applies. Where the crime is prepared before the commencement of execution, it constitutes preparation or conspiracy, and in principle this is punishable only where the law provides a penalty provision. The prevailing view is that the point of commencement of execution is determined by whether the risk of occurrence of the result is objectively recognized, and this boundary is frequently disputed in practice in serious crimes such as murder and robbery.

Complicity and Attribution of Criminal Conduct

Criminal conduct may be committed alone, but where multiple persons are involved, joint principals, instigators, and accessories (aiders and abettors) arise. Joint principal liability requires a common intent to commit the crime and functional control over the act; aiding and abetting is established where the accessory facilitates the principal's act of execution. Issues such as the dependence of accessories, complicity and status, and successive joint principals are core issues in the General Part of criminal law.

Proof of Criminal Conduct

In criminal proceedings, the existence of criminal conduct must be proven by the prosecutor through evidence, and this is governed by the principle of evidentiary adjudication, the rule excluding confessions obtained improperly, and the exclusionary rule for illegally obtained evidence. In recent years, scientific evidence such as digital forensics, analysis of communications data, CCTV and dashcam footage, and location information has moved to the center of proving criminal conduct, while the authenticity of evidence and the lawfulness of collection procedures have simultaneously become contested issues. If there is no proof sufficient to exclude reasonable doubt, the defendant is acquitted.

Sentencing and the Gravity of Criminal Conduct

Once guilt is established, sentencing takes place within the range of the statutory punishment, and factors such as the motive, means, and result of the criminal conduct, whether the damage has been repaired, remorse, and the risk of recidivism are considered. The Sentencing Commission of the Supreme Court has established sentencing guidelines for major categories of crimes and presents recommended sentences; repetition of the same type of criminal conduct or organized criminal conduct operates as an aggravating factor.

Victims and Restorative Justice

Criminal conduct leaves direct damage not only on the relationship between the actor and the state but also on the victim's life. In criminal proceedings, the victim's right to make a statement, compensation orders, and support systems under the Crime Victim Protection Act are operated, and restorative justice and reconciliation and mediation programs are expanding as alternatives that seek both reparation of harm and prevention of recidivism.

Recent Trends

In 2024–2025, types of criminal conduct occurring in digital environments are increasing rapidly. Punishment for the production, distribution, and possession of sexually explicit deepfake and other synthetic-video material has been strengthened, and sentencing for online grooming of minors and distribution of illegal recordings is also trending upward. For organized cybercrimes such as voice phishing, investment fraud, and ransomware, the response system is being reorganized around international cooperative investigations and confiscation of criminal proceeds. In drug-related criminal conduct, with online distribution and the spread of new synthetic drugs, enforcement methods have shifted toward platform monitoring. As the scope of application of the Serious Accidents Punishment Act expanded to workplaces with fewer than 50 employees, the responsible parties and preventive duties for industrial-safety-related criminal conduct became contested issues, and discussions continued on the effectiveness of corporate punishment and joint-penalty provisions. In addition, discussions are underway on whether fraud, defamation, and copyright infringement using AI-generated outputs can be subsumed under existing elements of crime and whether separate legislation is needed. In investigative practice, securing the integrity of digital evidence and the lawfulness of search-and-seizure procedures are repeatedly raised in higher courts, and balancing the scientificization of proof of criminal conduct with human-rights protection remains an important task.