The Japanese/Korean Linguistics Conference is a site for research on Japanese and Korean in a variety of areas, as well as comparative research on similarities and difference between the two languages. The papers included in this volume are from the 20th Japanese/Korean Linguistics Conference, which was held at the University of Oxford. The contributions include studies in syntax, semantics, phonology, prosody, psycholinguistics, sociolinguistics, conversation analysis, historical linguistics, dialects, discourse, functional linguistics, and first and second language acquisition. This volume deepens our understanding of both languages in these provide a useful reference for students and scholars in these fields.