Moreover, the evidence of individual differences is shown immediately, which means that if people feel anger, anxiety, happiness, and sadness, they are directly shown to others with their faces. Therefore, sometimes people have difficulty relating to others because they may have different thoughts and opinions about many different aspects of life. Furthermore, many people might hurt the feelings of others with introverts and extroverts in their personality. Therefore, they must be careful in saying words to others to maintain a good relationship with them