Purpose : In international sales contracts, even though the United Nations Convention on Contracts for the International Sale of Goods (CISG) is primarily applied, issues arise when the CISG lacks specific regulations or when its substantive content is insufficient. This study examines foreign case law related to such external and internal defects within the CISG framework.
 Research design, data, methodology : In the 2021 Supreme Court decision (case number 2021다269388), the court highlighted the lower courts' failure to consider international legal elements and instead applying domestic law to international sales contracts. In this study, we analyzed foreign case law concerning the issues of applying the CISG versus domestic law, as well as external and internal defects in the context of these laws.
 Results : Through this research, we were able to review case law from various countries regarding the preferential application of the CISG in international sales contracts. Additionally, in many cases involving external and internal defects, we observed the application of domestic law in accordance with principles of private international law, or the necessity to apply other international conventions.
 Conclusions : This research underscores the importance of a deep understanding and knowledge for the appropriate application and interpretation of the CISG in international transactions. It suggests the need for an international and comprehensive approach to legal issues related to international trade in the future, emphasizing the significance of understanding the application of international law both in education and in practice.
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