Ann, a girl student, never smiles at school. The teacher said to visit her home, but she refused. One day, the teacher found Ann carrying a bag on the road.

The girl Ann seems to be a cold and silent person, because she never smiles. The classmates all laughed at her for facial paralysis, but Teacher An An was very worried about her. Why is a normal girl of ten generations so silent and indifferent? Out of a sense of responsibility and morality, the teacher decided to settle down. Before the home visit, the teacher asked Ann's opinion, Ann bowed her head, and then politely refused. The teacher could see that Ann was in low spirits when she said she would visit her home. He is very confused. He noticed that Ann didn't reject communication with others, and she was grateful when Ann refused him. Although the teacher wants to solve the problem, he is still very grateful.

One day, the teacher found Ann in the street. Just when he wanted to say hello with a smile, he found Ann smiling at a middle-aged woman with a list! Perhaps because of Ann's so-called smile, the middle-aged woman immediately unloaded her baggage and ran away quickly. The teacher always feels that something is wrong. That woman seems to have something to do with Ann's cold way of treating people at school. So the teacher went after the woman, trying to understand the relationship between the woman and Ann, and let him understand the abnormality of Ann and how to solve Ann. When he finally caught up with the woman, he found that Ann had been chasing him. Ann kept gesturing to the woman as if to ask her why she ran away. The woman seemed to understand what Ann was doing, and then she pointed to the teacher.

Finally, the teacher learned what happened from Ann's mouth. It turns out that the middle-aged woman is Ann's mother. An An's father died when An An was six years old, and their mother and daughter lived alone. Unfortunately, Ann's mother is deaf and dumb. Although her mother loves her very much, Ann still can't communicate with her mother in words. Ann knows from a book that smiling is the best way to communicate, so she smiles at her mother every day to express her love for her mother. For others, smiling is just a way of communication. But for Ann and her mother, smiling is actually the fusion of their love. After listening to such a story, the teacher finally understood why Ann was indifferent to others, because smiling is not only a special way for Ann to communicate with her mother, but also the only way for her to express her love for her mother.