First, the study compares the differences between the film and the original script of "Eternal Summer"; second, it reviews the sexual hints hidden in both film and original script of "Eternal Summer", as well as problems of two main male characters, Shane YU ( 余守恆) and Jonathan Kang ( 康正行), including their stream of sub-consciousness, traumatic experience, narcissism and self-identity. The last but not the least, the "mirror phase" proposed by Jacques Lacan is introduced to analyze deeply the subtle relationship, separated and complementary at the same time, between these two characters via divided and complete mirror image. After reinterpreting the original script and the image, the study looks forward to analyzing "Eternal Summer" by a whole new perspective of psychoanalysis and observing the complicated psychological change and love choices (or the choice of sexuality) of two characters when it comes to sub-consciousness, trauma, narcissism and self-identity, which make the story deeper and more meaningful and broaden the horizon of the audience.