This article “The Case Studies of Daily-Life Discourses between Thai and Korean Cultures” is aimed to introduce a study about daily-life discourses between Thai and Korean cultures by using the fact of misunderstanding in 12 events of the dialogues between people of the two cultures. Those 12 situations were derived from the author’s own direct experience and the indirect experience obtained from interviewing some Thais and Koreans. The author does not want either to judge which culture is better or be more recognized than the other, but to learn and to present an issue in order to create the accurate understanding and acceptance between Thailand and Korea. This will certainly improve the efficiency and effectiveness in the communications among people of the two countries. The author applied the theoretical principles and concepts from the sociolinguistics, critical linguistics, and discourse and discourse analysis as a framework of analysis.