In May 2023, a horrifying crime shocked all of South Korea and quickly became one of the country’s most disturbing modern murder cases. What initially appeared to be a harmless tutoring arrangement in the city of Busan turned into a carefully planned act of violence carried out by a young woman obsessed with true crime and the idea of committing the “perfect murder.”
The case of Jung Yoo-jung captured worldwide attention because of its disturbing level of premeditation, deception, and brutality. Investigators later revealed that Jung had spent months studying murder documentaries and crime books before carrying out her attack.
Here is the full story behind one of South Korea’s most chilling criminal cases.
A Student Searching for Help
On the evening of May 25, 2023, 23-year-old Jung Yoo-jung sat inside the bedroom she shared with her grandfather in Busan. According to later reports, she appeared deeply focused on preparing for what she claimed was an important English examination.
Frustrated by her inability to study effectively on her own, Jung searched for private tutoring assistance through a mobile tutoring application. She contacted dozens of tutors, pretending to be a ninth-grade student in desperate need of academic help.
After many failed attempts, she finally received a promising response from a tutor named Chae-un, a 26-year-old college student fluent in English. The tutor agreed to meet Jung and even offered to begin lessons almost immediately.
For Jung, this meeting represented more than just a tutoring session. Unknown to anyone else, she had already been planning something far darker.
The Meeting at the Apartment
Two days later, on May 27, Jung traveled nearly an hour by bus to reach the tutor’s apartment on the northern side of Busan.
She carried a large bag filled with what appeared to be study materials. To the tutor, Jung looked exactly like a nervous teenage student preparing for exams.
When Chae-un opened the apartment door, she warmly welcomed her visitor inside. The two sat together in the small studio apartment and discussed Jung’s supposed academic struggles.
Jung explained that she needed help preparing for a major English test. Chae-un reassured her that she could help and suggested they begin working together.
At one point, the tutor stepped into the kitchen to get a glass of water.
That moment changed everything.
A Carefully Planned Murder
While the tutor was in the kitchen, Jung retrieved a knife she had secretly brought with her.
Investigators later discovered that Jung had not arrived carrying ordinary school supplies. Hidden inside her luggage was the weapon she intended to use.
When Chae-un returned, Jung attacked her, stabbing the young tutor to death inside her own apartment.
Authorities later revealed that Jung dismembered the victim’s body and placed the remains inside a large black suitcase. She then left the apartment complex and hailed a taxi late that night.
The Taxi Driver Who Became Suspicious
The case may never have been solved so quickly if not for the instincts of a taxi driver.
The driver noticed Jung struggling with an unusually heavy suitcase as she requested transportation to the remote Nakdong River area outside Busan. The destination immediately struck him as suspicious because the area was isolated and rarely visited late at night.
During the drive, Jung remained quiet. Once they arrived near the wooded trailhead by the river, she insisted on handling the suitcase herself.
The driver watched as she struggled to drag the heavy luggage into the darkness.
Something felt terribly wrong.
Instead of immediately leaving, the driver waited nearby and continued observing the area. Roughly 20 minutes later, Jung emerged from the woods with the same suitcase — but this time it appeared almost empty.
Realizing that something suspicious had likely happened, the driver contacted the police.
Police Discover the Truth
When officers arrived, they questioned Jung about why she was alone in the area so late at night.
She calmly claimed she had only come to dispose of trash because the dumpsters near her apartment were full.
However, officers became alarmed by the condition of the suitcase. After opening it, they discovered blood soaked throughout the interior lining.
Jung attempted to explain the blood away by claiming it was menstrual blood, but investigators immediately doubted her story.
That encounter marked the collapse of her carefully constructed plan.
Police soon uncovered the horrifying truth: Jung Yoo-jung had created an elaborate false identity, posing as a teenage student in order to lure a tutor into a vulnerable situation.
Obsession With True Crime
As investigators dug deeper, they learned that Jung had become intensely fascinated with true crime content.
Reports suggested she spent months consuming documentaries, crime novels, and murder-related media while researching how to commit what she believed would be the “perfect murder.”
Authorities concluded that the killing was not spontaneous. It was a deliberate experiment driven by obsession and fantasy.
The revelation shocked the public across South Korea, where violent crimes of this nature are relatively rare.
Many people were disturbed not only by the brutality of the murder, but by the calculated planning behind it.
Trial and Sentencing
Jung Yoo-jung was eventually charged with murder and related crimes.
During the trial, prosecutors argued that the killing was meticulously planned from the beginning. Evidence showed that Jung deliberately targeted the tutor after pretending to be a young student seeking academic help.
The court ultimately found her guilty of murder.
She was sentenced to life in prison.
Why the Jung Yoo-jung Case Shocked the World
The Jung Yoo-jung case became internationally infamous for several reasons:
- The elaborate deception used to lure the victim
- The influence of true crime obsession
- The shocking brutality of the attack
- The eerie calmness Jung displayed afterward
- The taxi driver’s critical role in exposing the crime
For many observers, the case raised difficult questions about the psychological effects of violent media obsession and the dangers of online anonymity.
It also served as a reminder that instinct and vigilance — like the taxi driver’s decision to contact authorities — can sometimes prevent criminals from escaping justice.
Final Thoughts
The murder committed by Jung Yoo-jung remains one of the most disturbing criminal cases in recent South Korean history. What began as a seemingly ordinary tutoring arrangement ended in tragedy because of one woman’s obsession with testing whether she could commit the “perfect murder.”
Instead of achieving the flawless crime she imagined, Jung’s plan unraveled within hours, leading investigators directly to her.
Today, the case continues to fascinate and horrify people around the world, standing as a chilling example of how dangerous obsession, deception, and violent fantasy can become when left unchecked.