The purpose of this article is to define the authenticity as an Idee of ethics and explore the possibility of narrative ethics as a condition for this ethics to be realized. One of the major ethical values of modern Western is known for autonomy. However, Charles Taylor explains authenticity as an emphasis on the inner world, arguing that the value of authenticity, other than autonomy, is a major ethical value in modern Western and should be emphasized again today. But as Michel Foucault has already argued, I would argue that this tradition of authenticity is already starting from ancient Western. According to Foucault, the ethical principles of the ancient West can be defined as selfcare containing self-knowledge, and the characteristic of this is selfdiscipline through self-knowledge to obtain a life purpose or value. And self-knowledge and relationship with oneself become the most important thing for self-care. Therefore, self-care, which means relationship with oneself, awareness of inner self, and faithfulness to oneself, is an ethical principle that coincides with the value of authenticity. In other words, self-care forms the basis for the demand for authenticity, and this demand moves toward self-identity and self-realization. And this is the main characteristic of defining the ethics of authenticity as the ethics of a good life. And I would argue that narrative ethics is required to realize this ethics of good life as authenticity. I will argue this through an explanation of the narrative ethics of Paul Ricoeur and Alasdair MacIntyre.