South Korea Supreme Court Says Working Hours Alone Cannot Decide Overwork Death Claims

A fatal night shift brings a broader test of workplace harm

A hotel maintenance worker averaged 40 hours and two minutes of work a week before suffering a fatal brain hemorrhage. South Korea's Supreme Court has ruled that the number alone was an inadequate reason to reject his family's compensation claim, pointing instead to approximately 12 years of rotating shifts, rising blood pressure and demanding work in a basement mechanical room.

On October 27, 2026, the court's First Division overturned a judgment against the family and returned case 2024Du40400 to the Seoul High Court. Justice Ma Yong-ju was the justice responsible for the case. The decision requires judges to examine how working hours, shift patterns, physical demands and hazardous surroundings acted together.

The worker, identified as A, was 41 when he was found unconscious at about 5:30 a.m. on April 16, 2019, after working overnight at the Sheraton Seoul Palace Gangnam Hotel, which has since closed. He died after being taken to hospital. An autopsy identified a nontraumatic intracerebral hemorrhage, meaning bleeding inside the brain that was not caused by an external injury.

His spouse sought survivor benefits and funeral expenses from the Korea Workers' Compensation and Welfare Service. The agency rejected the application, and two lower courts upheld its decision, relying heavily on working hours below government indicators of chronic overwork.

The Supreme Court's ruling gives the family another opportunity to obtain compensation, rather than an immediate award. The Seoul High Court must reconsider the connection between his job and his death under a broader legal test. No date for that reconsideration was given.

What the hours reveal about his final weeks

A's average working week grew longer as the hemorrhage approached. Across the preceding 12 weeks, it was 40 hours and two minutes. Across the final four weeks, it rose to 44 hours and 32 minutes. In the final week, he worked 54 hours and 33 minutes.

The final week's total was 14 hours and 31 minutes above his average over 12 weeks, an increase of about 36%. That comparison matters because the Ministry of Employment and Labor's assessment framework treats an increase of at least 30% in workload, hours or intensity during the preceding week as an indicator of a short period of excessive work.

The framework also uses longer periods to assess chronic overwork. Average weekly hours exceeding 60 over 12 weeks, or 64 over four weeks, indicate a strong connection between work and the onset of brain or heart disease. Above an average of 52 hours over 12 weeks, the assessed connection increases as hours rise.

A was below those indicators of chronic overwork. His case therefore turned on whether judges could stop at that numerical comparison, despite the sharp increase in his final week and the demands of his wider working life. The Supreme Court said they needed to examine those other circumstances.

Why the ministry's guidance is not a judicial cutoff

The Supreme Court treated the ministry's notice as administrative guidance for the compensation agency, rather than a rule binding judges. Courts must decide whether employment had a sufficient causal connection to an illness by examining the worker's circumstances, including factors beyond total hours.

The Ministry of Employment and Labor publishes its occupational disease assessment framework under Article 37(1)(2) of the Industrial Accident Compensation Insurance Act and Article 34(3) of its Enforcement Decree. Its April 2022 amendment notice, published on April 28 by the Industrial Accident Compensation Policy Division, records a later revision covering brain, heart and musculoskeletal diseases. The amended text is attached as an HWP document rather than displayed on the webpage.

That 2022 publication came after A's death in 2019. The Supreme Court's reasoning addressed the assessment framework relevant to his claim, including its recognition that unpredictable schedules, rotating shifts and hazardous environments can increase the connection between employment and illness even below 52 hours a week.

The practical effect is straightforward: hours remain useful evidence, while the court must also consider when the work happened, how strenuous it was and what conditions surrounded it. Several burdens acting together can matter more than a weekly average suggests.

Twelve years of shifts, not just three months of records

A began working at the Seoul hotel in September 2012, joining its facilities operation through a maintenance company. His duties included cleaning air conditioning equipment, draining sauna baths, operating boilers and repairing the systems that kept the building functioning.

His rotating schedule began earlier. From about 2007, he had spent roughly five years maintaining a senior residential complex with more than 500 units, also working day and night shifts. His combined history of shift work therefore stretched across approximately 12 years.

The hotel's intended rotation involved consecutive day and night shifts, followed by three days off, then a night shift and one day off. During the final three months of his life, that pattern was not properly maintained. The Supreme Court considered this history alongside the final weeks of recorded hours.

The major events unfolded over nearly two decades:

• About 2007: A began rotating shifts in facilities maintenance at a senior residential complex.
• September 2012: He began maintaining equipment at the Seoul hotel.
• 2014: A health examination recorded blood pressure of 110/70 mmHg.
• November 2017: His recorded blood pressure had risen to 152/90 mmHg.
• April 16, 2019: He was found unconscious after working overnight and died that day.
• October 27, 2026: The Supreme Court overturned the adverse judgment and returned the case to the Seoul High Court.

The basement workplace added several burdens

A worked in a mechanical room on the hotel's third basement level. Conditions included persistent noise measured at approximately 78.5 decibels, mineral dust, welding fumes and hazardous substances including chromium and manganese.

The room was damp, and the hotel building was more than 20 years old. Equipment needed frequent repairs. A sometimes had to enter spaces cramped for his body, with injuries occurring during repair work. He also dealt with complaints from hotel employees and customers when facilities required attention.

The Supreme Court considered rotating shifts, hazardous surroundings and substantial physical demands together. Each added a different kind of burden: irregular hours could disrupt rest, repair work required exertion, and the mechanical room exposed him to noise and airborne substances.

For the reassessment, the important issue is how those conditions combined with A's health and working history. The lower courts had given greater weight to scheduled rest after night work and to an assessment that the noise was insufficient to affect his health. The Supreme Court required a wider examination of the working environment as a whole.

Why his blood pressure became central

A's health examinations recorded blood pressure rising from 110/70 mmHg in 2014 to 152/90 mmHg in November 2017, placing the later reading in the hypertension range. Hypertension means persistently high blood pressure, which places strain on blood vessels and can contribute to bleeding in the brain.

The Supreme Court considered whether years of rotating shifts had helped produce that increase. It reasoned that his nighttime blood pressure may have remained elevated over a long period, and that the change in his blood pressure could be linked to his shift work and have played a major part in the hemorrhage.

The court examined two possible connections. His working conditions may have contributed to hypertension itself. Alternatively, the demands of work may have acted together with existing hypertension to trigger, accelerate or worsen the hemorrhage. Both possibilities required consideration in deciding whether the death qualified as an occupational injury.

The justices also referred to research connecting night work with vascular disease and to the International Labour Organization's 1990 Night Work Convention. The convention addresses health assessments for night workers and transfer to other work when health makes night duties unsuitable. These references supported the court's attention to the health burden of working through the night.

Why the lower courts reached a different result

The lower courts accepted the compensation agency's position that A's hours did not meet indicators of chronic overwork. They also relied on medical opinions pointing to personal health factors, including weight gain and hypertension, as likely causes of the hemorrhage.

The first court cited smoking and a lack of treatment among its concerns. The second accepted an expert view that seven or eight night shifts a month did not amount to chronic excessive work. It also considered rest periods after overnight duties.

The final week's increased hours were another disputed issue. The lower courts noted that some recorded time involved attendance at a union training event. The Supreme Court rejected narrowing the assessment simply on that basis and considered the rise in his working hours relevant to an increase in burden shortly before the hemorrhage.

The justices also questioned treating A's physical size, 180 centimeters tall and weighing 88 kilograms, as sufficient grounds to fault his health. They considered that he appeared to have managed his health through exercise. They further noted that a 2017 revision to the ministry's notice had removed health status from the listed factors used to assess the connection between work and disease.

The legal test focuses on the individual worker

The Supreme Court said causation should be assessed in light of A's own health and physical condition, rather than those of an average person. In plain language, judges must ask how this work affected this worker, including any interaction between job demands and an existing illness.

That approach matters when a condition such as hypertension is involved. A worker can have a medical vulnerability while employment also contributes to a fatal event. The court's task is to assess the connection between the work, the underlying condition and the resulting illness.

A's family had waited six years and nine months from the filing of the lawsuit to the Supreme Court's decision. Attorney Seo Bo-yeol represented the worker's side. The ruling changes what the Seoul High Court must examine after that lengthy process: the combined effects of his work history, final increase in hours, physical duties and workplace exposures.

What changes for other compensation claims

Workers with rotating schedules or hazardous jobs now have a ruling that rejects using an hours figure as the sole reason to dismiss a connection between employment and brain disease. The judgment directs attention toward the full burden of a job, including demands that a weekly total can hide.

A's case also shows why different time periods can tell different stories. His average over 12 weeks was close to 40 hours, his final week exceeded 54 hours, and his shift work history lasted about 12 years. Each figure describes a separate part of the exposure that the court considered relevant.

The Seoul High Court will now reconsider the family's challenge to the refusal of survivor benefits and funeral expenses. For that family, the concrete issue remains compensation following a death in 2019. For other claims involving night work, the judgment supplies a broader method of examining whether employment caused or aggravated disease.

Key Points

• The Supreme Court overturned the judgment against A's family on October 27, 2026, in case 2024Du40400.
• A averaged 40 hours and two minutes a week over 12 weeks, rising to 54 hours and 33 minutes in his final week.
• The court required consideration of approximately 12 years of rotating shifts, hazardous conditions and demanding physical work.
• His blood pressure rose from 110/70 mmHg in 2014 to 152/90 mmHg in November 2017.
• The ministry's working hours guidance does not bind judges deciding the connection between employment and illness.
• The Seoul High Court must reassess the claim. Survivor benefits and funeral expenses have not yet been awarded through this ruling.