Revisiting and interrogating the knowledge production and transformation of narcissism in psy knowledge (psychoanalytical, psychology, psychiatric and psychotherapy), criminological and cultural theorizations, this thesis examines the narcissism discourses from 1950s to nowadays in order to see how the concept of narcissism is incorporated into different knowledge domains in contemporary Taiwan. Increasingly known and used as the synonym of vanity and egoism in mass culture nowadays, narcissism has been deprived of original context, lent to different domains outside of its Freudian psychoanalytical context and reduced to the problem related only to the I. Starting the problematic from the discourses of narcissistic personality disorder (NPD) in the 2014 Taipei Metro attack event (also called Cheng Chieh event), this thesis hopes to probe into the history of narcissism in Taiwan before the event to see the development of narcissism discourses in Taiwan. Tracing the interdisciplinary texts of narcissism theorizations, this thesis hopes to find out what contributes to the narcissism discourses of the Cheng Chieh event and examines the event as the reflection of tendency of contemporary development of narcissism discourses. Through historicizing narcissism discourses, this thesis hopes to see the concept of narcissism as a product embedded in complicated interactions and entanglements between the I and the world in different time periods and to provide a different perspective in viewing the contemporary narcissism discourses.