My school used to be like this. All majors say that they are the mainstay of the school and compete for people crazily. The person in charge of this major will not let people go. We have all used this method. Of course, in order to be less embarrassed in the future, we should properly handle the relationship with the current professional teachers or directors, and don't be so formal, because maybe they will play a key role in the future life. (For example, some public course grades, such as directors, are all qualified or specially responsible for a certain course, which is really blunt and afraid of offending villains).