In this chapter, we learn that Park Jinx is a serial killer who has committed three copycat murders in a row since the 21st of January. He is also known as the "third finger killer copycat" because he is wearing the same shirt as the first two victims. The only information about him is the photo of the finger killer, which contains the address of the third victim. Park jingoo tells us that the only information he has is the address on the photo. He tells us to squeeze for him, and to shut up, because his body is not "normal" and he might never be able to live the rest of his life. He says that he used to be a psychologist who studied the human desire to murder. He used to study the "human desire for murder," which is loneliness, in an "unhealthy family environment." Children who grow up in such an environment are not able to adapt to society, and therefore, become serial killers. He explains that only a few children fall into this desire, and that only those who live in "suppression and control" are able to be serial killers