Eak Tai Ahn is not only the first generation of Korean musicians, composers and conductors to have studied Western music and given successful musical performances in Western countries, but also is among the first to introduce the music of Korea to the West utilizing the Western music system. Korea Fantasy is an important work that helped Ahn win international acclaim. Korea Fantasy is an orchestral piece that evolved along with Ahn's unique life experiences shaped by the state of his native country. The piece is programmatic, depicting the history of Korea, which utilizes musical devices, such as rhythms and quotation that are distinctive musical elements of Korea. This document discusses the political and social history of Korea during Ahn's life time, offers an overview of Ahn's education and musical footsteps, and describes the premiere and reception of Korea Fantasy. Moreover, a discussion of his compositional traits and a musical analysis of Korea Fantasy are presented.