Abstract
1. Introduction
2. Background for the study
2.1 Jejueo: dialect or language
2.2 Jejueo as an endangered language
3. Discourse marker and keymey
3.1 Discourse marker: what is it?
3.2 keymey in Jejueo
3.3 keymey as discourse marker
4. Discourse functions of keymey
4.1 Derived property
4.2 Basic property: politeness
5. Conclusion
References