The main purpose of this article is to discuss of the Other and its relationship with Human person in Kierkegaard's view. Our chief question in this article is whether we know ourselves in the mirror of the other or if the other is a barrier and hindrance to our cognition of ourselves. In this paper, first, we review the place of the other in the three stages of life and point out their differences with each other. Then, we continue to focus on the Ethical stage where is the main realm of the emergence of the "Other". After discussing the necessities and limitations of this stage, we review the topic of Love, focusing on the book "Works of love". Lastly, we ask this question that if the Other has the same place in Kierkegaard's eye just as concrete with all those flesh and blood and special traits as "Self" or Human person. In other words, what is the place of concrete Other in Kierkegaard's view? Does Kierkegaard ignore the concrete Other and bury its individuality by considering the Other as the mirror or model? Or does he promote the Other's status by making it into an ethical principle?