Clark originally taught at the advantageous Wellington High School, but resigned and moved to a chaotic high school in the black community, because he learned that most of the students here do not know literary masterpieces such as A Tale of two cities and Don Quixote, and some do not know where Canada is located. In his view, there is nothing wrong with the students themselves, and all of them have the potential to become top students. As long as they teach students in accordance with their aptitude, there is no such thing as a bad boy.