Psychology, why do some people look innocent, but always feel that they are very shrewd?

Some people looked innocent but always felt that they were shrewd because in psychology, people usually interpreted some behaviors as hidden intentions or strategies. This interpretation was often based on their own experience and knowledge. Therefore, when we meet someone who looks innocent, we might think that he is shrewd because he is trying to hide his true intentions or strategies. People would also infer the other party's emotions and intentions based on their expressions, words, and actions. This kind of inference can also lead us to have a negative first impression of someone because we may only judge their true personality from what we see on the surface. However, innocence and shrewdness were not necessarily mutually exclusive concepts. Sometimes, a person might look innocent because he lacked the ability to protect himself or because he did not have much social experience and could not hide his intentions well. Under such circumstances, he might show some shrewd behavior to protect himself or show his strength. Therefore, when we meet someone who looks innocent but always feels like a shrewd person, we should remain calm and not jump to conclusions easily. We need to understand his true personality and motives to better understand his behavior and way of thinking.