The teacher will be happy, because as long as you answer the teacher's question, even though you have the wrong number. Because your answer to his question is respect for him, affirmation of his class, and the best cooperation with him in class will make him more interested and passionate in class. You left him a message when you answered incorrectly, but his classmates didn't understand the question. It is necessary for him to tell it again. It is the teacher who knows the class situation in time, so the teacher will not be disappointed, but will be very happy. Remember, teachers are always students who like to answer questions in class. This is the best cooperation for his class.