Koh Younghoon, a board member of the Korean Association for Public Interpretation and Translation (professor at the College of Occidental Languages, Hankuk University of Foreign Studies) published Indonesian Conversation 1 in May 2018. It consists of text, vocabulary study, grammar explanation, sentence practice, repetitive learning, and confirmation learning. In vocabulary study, vocabulary and its derivatives are explained in the text, but meaningful words rather than a single meaning of vocabulary can be grouped together to learn word clusters. The grammar chapter explains the basic grammar necessary to understand conversational sentences, and in sentence practice, the main sentence types appearing in texts are explained.​