The purpose of this study is to find out the characteristics of the Adjustment in Korean School Life of the English Assistant Teacher. The object of this study was the English Native Assistant Teacher(ENAT) in a middle school, and the research data have been collected and analyzed based on direct observations, in-depth interviews, and documents according to the qualitative research tradition from March 2010 to September 2010. Three main characteristics to adjust to the class were discovered through the study: 'Making and using teaching materials in person', 'Showing with gestures in class', and finally 'Following cooperative teachers'. The first characteristic is that ENAT makes and use her own teaching materials in class for the easier and more interesting class. The second characteristic is that ENAT uses many kinds of gestures during class because she knows the explanation with them is much easier and more interesting for the students. The last characteristic is to accept cooperative teachers' requests without arguments. Three main characteristics to adjust to the school life were discovered through the study: 'Avoiding the disagreement on purpose', 'Borrowing others' help', 'Staying alone', and finally 'Becoming a generous person'. 'Avoiding the disagreement on purpose' is to pretend not to know about the circumstances that are taking place inside the school. 'Borrowing others' help' is to solve the problem more easily by using cooperative teachers or students. 'Staying alone' is to live alone in English Only Room, her own office, and search the internet website to find good teaching materials or communicate with the students who visit there. 'Becoming a generous person' is to follow the opinions of other school members like School Managers, Korean English Teachers and the students, if possible.