This document introduces Duremaji, a Concerto for Flute and Korean Traditional Orchestra by the Korean composer HaeSik Lee (b.1943). It argues that the diverse orchestration exhibits a contemporary, traditional, and multicultural character. The genre of this concerto is Changjak-Kukak (Korean new traditional music). In Duremaji, Lee fused together contemporary flute repertoire and traditional Korean music. In the concerto, the flute expresses the character of both contemporary Western and traditional Korean music; Lee explains how Dure, which refers to cooperative farming communities in Korea, signifies the conversation between Western and Korean music through the flute. The document presents the influences of folk and shamanic ritual music and dance on the composer after 1970 and contextualizes Duremaji within the genre of Changjak-Kukak. The document also presents an analysis of the work and examines how Lee adapts traditional Korean instrumental techniques to the Western concert flute.