Previous understanding, based on older research, suggested that relations between Iran and the Korean Peninsula were limited to recent centuries, not extending beyond a hundred years. However, recent studies indicate that the history of interactions between these two ancient lands dates back approximately 1500 years. The earliest signs of connection between Iran and the Korean Peninsula are observed during the Korean Three Kingdoms period (especially Silla) and the Sasanian Empire in Iran. Although direct evidence in this regard is scarce and scattered, numerous indirect documents exist that help us in proving this claim. Therefore, answering the following questions becomes important:What kind of relations existed between Iran and the Korean Peninsula in antiquity? And what archaeological, historical, and cultural evidence and documentation confirm these long-standing relations?This research, utilizing evidence and documents available in historical sources and archaeological findings, as well as employing a descriptive-analytical method, delves into the analysis and examination of the relations between Iran and the Korean Peninsula in antiquity. The most significant of this evidence includes findings from ancient sites, excavated artifacts, and artistic patterns. The results of this study clearly demonstrate that Iran, during the Sasanian period, had extensive interactions, particularly in the cultural and artistic fields, with the Korean Peninsula. The overall outcome of this research is derived through the examination of glass vessels and their manufacturing techniques, animal patterns, and the mutual influence of various artistic styles