This paper takes the decorative elements of buyao golden leaves on the Korean Peninsula as its primary research object and explores their evolution from physical form to aesthetic connotation within a cross-cultural East Asian framework. Drawing on archaeological typology, technological analysis, and iconographic interpretation, it traces the origin of buyao in early Chinese ritual and decorative systems and demonstrates how, during the Han and Jin dynasties, its forms and symbolism were transmitted eastward and underwent processes of localization and reinterpretation. The study pays particular attention to the transformation and recombination of golden leaf motifs during the Goguryeo and Silla periods, revealing how craftsmen achieved aesthetic innovation through changes in material carrier, decorative density, and rhythmic motion. The findings indicate that Korean artisans not only inherited the dynamic aesthetic principles of Chinese and Central Asian crown ornaments but also restructured them creatively according to local belief systems, ritual codes, and aesthetic values. By incorporating indigenous symbols such as tree-like “Y-shaped” branches and abstract bird-wing forms, they generated a distinctive visual language that combined sacred vitality with hierarchical order. The process of cross-cultural translation seen in these artifacts thus embodies both technological hybridity and cultural agency. It reflects the multilayered accumulation and interaction of East Asian material civilizations and underscores the Korean Peninsula's active role in reconstructing its own cultural subjectivity through artistic adaptation, innovation, and synthesis. Ultimately, buyao golden leaves function as tangible evidence of how aesthetic concepts, ritual meaning, and technical knowledge circulated, converged, and transformed across East Asia during antiquity.