The Theory of the Original Human Nature refers to the original status of mankind before the fall of man.
Traditional philosophy has no such field.
The true status of man will be a matter of importance when we establish an ideal society in the future and also when we deal with the true view of life. Therefore, philosophy in the future requires the Theory of the Original Human Nature. Essence and phenomenon are used as relative concepts. Existentialism regards realistic and unreasonable man as having lost something and fallen into error, and also maintains that there must be the original self which is called existence. The relationship between Sung Sang and Hyung Sang in the Original Nature is that between mind and body, spirit mind and physical mind, and spirit man and physical man.