This document provides definitions and explanations of important Korean and Unification terminology. It begins with short definitions of abbreviations and terms. It then explains the significance of learning the Korean language according to Sun Myung Moon and the Divine Principle. Several key terms are defined in more depth, including Cheon Il Guk, Cheon Seong Gyeong, and Indemnity. The document concludes with information about the Unification flag and eight textbooks of the True Parents. Overall, the document serves as a concise reference guide to core concepts and vocabulary within the Unification movement.