Scary Tehran by Moshfegh Kashani is considered as a pioneering social novel in Iran.In this article, we have tried to examine this novel from the social science perspective in order to explain its semiotics and answer the question of what signs this novel implies and whether the symptoms are ideological. To this end, following some preliminary introduction of the science of semiotics, we have analyzed the manifestation of signs in this literary work. Our findings indicate that the author has efficiently benefited from using signs in order to portray social problems such as social class differences, bipolar social system, and injustice. Further, the author  highlights the ideological concept of the symptoms and signs and how they represent the contrasts between the rich and the poor of late Qajar Tehran.