The transportation sector is on the brink of a revolution with Korea's breakthrough in hydrogen engine technology. While electric vehicles have made significant progress, the limitations of limited travel distances and long recharging times still exist. Korea's innovative approach involves using a 2-liter hydrogen engine that operates on pure hydrogen gas, providing similar ranges and refueling times as traditional gasoline vehicles. This new technology eliminates the need for heavy battery packs in electric cars, offering faster refueling times and a much higher energy density. Hydrogen as a fuel presents three key advantages over traditional batteries: compact and lightweight fuel cell stacks, quick refueling times of 3 to 5 minutes, and an energy density at least 3 times greater than batteries, allowing for longer travel distances. While hydrogen fuel shows promise for decarbonizing the sector, its widespread adoption may take longer compared to electricity. This development showcases the ongoing innovation in the automotive industry and the potential for a more sustainable future in transportation.