This study aims to explore salient features of Korean pre-service secondary English teachers in EFL writing assessment. In this study, 25 Korean pre-service secondary English teachers participated in essay ratings after taking a short rater training session. In essay ratings, they were asked to follow the guidelines for scoring an instructor provided, assign scores using holistic and analytic scoring methods and leave their written comments on each essay. Participants’ performance was evaluated using a mixed method. For quantitative analysis, the consistency and severity of participants were measured by FACETS. Through content analysis, the written comments were categorized and coded using Quirkos. The results revealed that participants tended to consistently assign a score on essays by focusing on four assessment criteria. They preferred to use rubrics provided by an instructor. Second, findings showed that they took various scoring strategies depending on their writing proficiency, severity level, and consistency. Particularly, it turns out that their language proficiency was a strong factor in influencing their performance in ratings. It suggests that pre-service teacher education programs for secondary English teachers should provide a curriculum for English essay writing, and a rater’s workshop to improve professionalism and confidence in writing assessment-related practices.