The dragon slaying boy eventually became a dragon.
First, what is a person?
Man is an animal.
The long evolutionary history is destined that humans have countless instincts that cannot be violated, because humans are animals. Freud believed that all human behavior is for sex, or more deeply, for gene transmission. His theory has far-reaching influence, although he has influenced most of the literary and art circles, and created a large number of artists and great writers, using this theory to liberate waves, this is a digression. Around 1960, his theory was shown to be incomplete, only partially correct. In addition to the instinct of gene transmission, people also have many instincts such as laziness, convergence, coughing, venting emotions and so on. Human behavior, including culture, economics, and sociology, is ultimately animal behavior.