Avery thought his new math teacher was cold and ineffective. But by the end of the year, he liked him. This is an example of the:

Avery thought his new math teacher was cold and ineffective but it turns out that by the end of the year, he liked him. This is an example of the bad or wrong first impression. You might think that you know how a person is but once you get to know them more, you realize that they're not what you thought them to be.