This study was conducted to determine the effectiveness of my writing instruction and prepare for the following writing instruction in a graduate school context in Southern South Korea. To achieve the goal, three research questions were raised and answered in a given order; 1) Participants of the study (N=13) show no progress in writing in terms of accuracy and fluency, 2) The most frequently appearing errors appeared in the pretest were Mechanics > Coherence or Cubing > Meaning > Agreement (Noun) > Article (A), and 3) Mechanics > Coherence or Cubing > Agreement (Noun) > Meaning > Preposition errors were survived at the end of the semester. Compared to the previous teaching context, my new students at a new university, called P university and graduate school students here after, show unique way of making errors in writing. Based upon the findings of the study, instructional intervention including writing was suggested as the form of the quizzes.