This little mistake impressed me deeply. People who have suffered the greatest setbacks in life are no longer one or two. Facing the cold confrontation, he believed that he could do it and suppressed it blindly. It is better to learn lessons, sum up experience and find out problems, so as to meet the difficulties. Happiness and sadness are just an attitude and a way. It's normal for him to be sad. The key is to let him learn from this defeat.