Abstract 0. Introduction 1. Korean Native Phonology 1.1. Consonant Inventory of Korean 1.2. The Syllable Structure of Korean 2. Data 2.1. Vowel Epenthesis 2.2. Consonant Deletion 2.3. Feature Changing 3. A Constraint-Driven Analysis 3.1. The Bifurcation of Loanword Phonology 3.2. Vowel Epenthesis 3.3. /r/-Deletion 3.4. Vowel Epenthesis at Code 4. Characterization of Epenthetic Vowel 5. Conclusion References