There is a saying that you shouldn't hit a smiling person, but in reality, this saying is completely the opposite. In the jungle world, people specifically target smiling individuals. No matter who you are with, as long as you show even a little bit of tension, a bit of cowardice or humility, a bit of eagerness to please, or a bit of honesty, then you will certainly suffer the greatest malice from this world. This is what it means to specifically target smiling people. In social psychology, there is a theory called the hunter dog effect. What does this mean? Everyone knows that lions and tigers are very powerful on the grasslands, but there is a kind of hunter dog that, although it has no real ability, is the second strongest on the grasslands, and even lions and tigers do not dare to provoke it. How does this hunter dog do it? They are a group of very perceptive animals. For example, when humans drive to the African savannah to watch animals, the hunter dog will politely and obediently sit by the side without bothering you. However, with each subsequent encounter, this hunter dog will gradually come closer to you, slowly starting to touch the car, pawing at it, and as soon as it senses even a slight bit of tension or fear from you, it will become increasingly aggressive in pawing at the car, constantly testing where your bottom line is. In relationships, maintaining an air of mystery and a sense of distance is the greatest deterrent to a person. The earlier the relationship, the more you must stand firm and not allow anyone the opportunity to gain free goodwill from you. And those who appear briefly in your life? You should especially not be fixated on making them like you. Colleagues, friends, and even lovers are just people who appear in your life for a certain period of time. It's important to know that everyone likes something free, but no one will cherish what is free. There are no relationships that cannot be lost, and there is no distinction between smiling and non-smiling faces. If you always smile at someone, they will definitely strike back at you.