This study was conducted to find out the effectiveness of my writing instruction and prepare for the following writing instruction in a university context in the Southern part of South Korea. To achieve the goal, three research questions were raised and answered in a given order; 1) Participants of the study show progress in writing in terms of accuracy and fluency, 2) The most frequently appearing errors appeared in the pretest were Agreement (Number) > Sentence types (Conjunction S+V, S+V) > Meaning > Parallelism > ST (Conjunction S+V, S+V) , and 3) Agreement (Noun numbers) > Meaning > Word Choice > Sentence types (Conjunction S+V, S+V) > Usage errors were survived at the end of the semester. Based upon the findings of the study, instructional intervention including writing was suggested as the form of the quizzes.