​​This study aims to investigate why Korean learners of Japanese often experience discomfort in communication with native Japanese speakers, despite their proficiency in the phonological, lexical, and grammatical aspects of the language. It is hypothesized that this issue stems from an insufficient understanding and acquisition of the unique discourse development patterns for native Japanese speakers. To address this, the study focuses on the discourse marker, YAHARI, which plays a critical role in Japanese discourse development, and analyzes its usage trends in Japanese animations and TV dramas. As a result, YAHARI was found to function as a discourse marker to convey shared information as a premise to advance the conversation. Also, YAHARI was found to be used independently and frequently combined with expressions like 'YONE' to confirm shared knowledge while progressing the discourse. In contrast, its combination with expressions like 'HORA', which explicitly prompt shared information, was observed less frequently. Based on these findings, it is suggested that educational materials aimed at improving the practical communication skills of Korean learners of Japanese be developed. Furthermore, future research should incorporate conversation corpora reflecting real-life conversational scenarios beyond animations and TV dramas to provide a more dynamic perspective. This approach would support Korean learners in achieving more natural communication with native Japanese speakers. Additionally, expanding the scope of research through in-depth analyses of other commonly used discourse markers in conversational contexts will be necessary.​​​​