Sexual profession
In addition to Confucius and Mencius, Cang Gokseol is a theorem about the human mind, which is one of the representative thinkers of Yuga, which is the theory that human nature is evil. Sung-ja's cynical music theory is represented by the proposition of a martial art which appears in the \u003cVoice\u003e section of his book, "Sungja". That is, the nature of man is evil, seeking profit from day one, jealous of one another, and hate each other, so that if left alone, the fighting does not stop. Therefore, in order to correct this, it was necessary to learn courtesy and train the mind.