Hello Hyunsu Lee, Thank you for your feedback. As you mentioned, not all students come from the same background, so I understand that the explanations may not have felt sufficiently welcoming or clear. I will work on improving this as I supplement the course materials to make them easier to understand. Additionally, I understand that the use of certain English expressions in the lecture might have been uncomfortable. However, since you will encounter English frequently in practical work, becoming gradually familiar with it as you study can also be helpful. If there are any specific parts you found particularly disappointing, please let me know. I will prepare additional explanations or supplementary materials focusing on those areas.