Perhaps you have never realized that the evolution of human society, from matrilineal society at the beginning to slavery later, cannot be separated from the maintenance of blood relationships, because blood relationships can bring people together almost unconditionally, care and love each other. Since then, various kinship relationships have emerged. Some people even judge themselves and their relatives in the process of social interaction based on the distance of the kinship relationship. It is undeniable that blood is a magical thing. It drives people's selfishness and expands it. It makes people feel more secure. Sometimes it can even influence a person's concept of right and wrong. However, if one day, all this is broken...