This article explores the role of emotions in L1 attrition and L2 acquisition in a group of 30 Korean-English L1-dominant late bilinguals in New Zealand. The relationship between L1/L2 proficiency measures and emotion-related language choice (ERLC) is investigated using three measurement tools: a story-retelling task, a questionnaire, and a follow-up interview. The findings point to a shift from L1 to L2 and show this to be related to an increase in L2 fluency and a decrease in L1 accuracy. The findings also show an overall preference for ERLC to be in L1 rather than L2 and point to a strong relationship between ERLC and proficiency. Two other findings emerge from the data. Scores for ERLC relating to anger show different patterns, as well ...