Joseph Cullman is a neurologist. He is engaged in the diagnosis and treatment of diseases related to the nervous system. Joseph has brown hair, has a mole near his left eye, and two piercings in his ear. He is a serious, calm, peaceful man. But he has a trait that no one notices. This person is yandere, and worse, he is a murderer. He kills his rivals or people who "interfere" with him. Besides, he is cunning and knows how to cover his tracks. In short, "Still waters run deep"