"경부" refers to the Gyeongbu Line, a major railway line in South Korea that connects the capital city, 서울, to the southeastern city of 부산. This line is crucial for transportation and commerce, facilitating the movement of people and goods between these two important regions. The Gyeongbu Line is part of the larger Korean National Railroad system and plays a significant role in the country's infrastructure. It includes high-speed train services, such as the KTX, which significantly reduce travel time and enhance connectivity across South Korea.