South Korea is delving into the potential of hydrogen combustion engines to decarbonize heavy-duty vehicles. The Ministry of Environment is organizing a policy forum in Seoul to strategize the expansion of hydrogen-powered transportation, exploring the incorporation of hydrogen combustion engines in the commercial vehicle market. Unlike hydrogen fuel cell vehicles, which are more energy-efficient and emit only water vapor, hydrogen combustion engines have slightly lower efficiency and emit nitrogen oxides but no carbon emissions. However, they offer practical advantages like easy retrofitting into existing vehicle platforms and faster recharging. Hyundai Infracore is at the forefront of developing this technology, unveiling the HX12 engine with promising efficiency levels. South Korea has made significant progress in its hydrogen fuel cell bus rollout, with a substantial increase in the total fleet size and charging stations for commercial vehicles. This initiative showcases South Korea's dedication to advancing clean transport technologies while considering scalability and infrastructure feasibility.