Thanks to my mentor, Mr. Park Dae Nam. Although I am usually busy with academic affairs, he gave me careful guidance and selfless help during the whole period of writing my graduation thesis. Especially in the paper language and grammar errors, wrong input and other small aspects have been carefully examined. It can be said that without the care and guidance of Mr. Park, there would be no successful completion of this paper.

Thanks to every teacher in the Korean Department for their earnest teaching and careful guidance over the past four years. Without all the teachers, there would be no progress and excellent results I have made now.

I am grateful to the Foreign Languages Institute and my alma mater Yangzhou University for their concern and training. No matter where I am in the future, I will remember that I am a student of Yangzhou University and strive to be an excellent young adult.

The paper is finished, and we are about to graduate. My heart is full of countless memories and incomparable nostalgia. In the past four years, many classmates and friends have given me sincere help. Please accept my sincere thanks!

Thank you! !