South Korea's researchers, including KIMM and Hyundai-Kia, have developed a groundbreaking hydrogen-powered two-liter engine with direct injection technology. This innovation significantly reduces emissions, with carbon dioxide reduced by 98% and fine particle emissions by 90%, surpassing EU standards. The hydrogen engine boasts a 40% thermal efficiency and cuts nitrogen oxides to under 15 parts per million without traditional exhaust systems. The potential for a nearly negligible carbon footprint sets hydrogen engines apart from traditional gasoline engines. Large-scale tests are planned to ensure the practicality and durability of hydrogen engines for mainstream adoption in the automotive industry. The development marks a pivotal moment in automotive history, combining progress with environmental stewardship. The article envisions a clean, sustainable future powered by hydrogen engines and emphasizes the positive impact on emissions reduction and efficiency. Through real-world applications in public transport, commercial fleets, and marine sectors, hydrogen engines demonstrate their potential across various industries for zero-emission mobility. The article concludes with the promising outlook for a hydrogen economy and the transformative impact it could have on the automotive industry and environmental sustainability.