Split Personality|(Y/N) x Mark(Dark)

This is a story between (Y/N) and Mark. You just moved into a new home and Mark happens to be your neighbor. But he suffers from Dissociative Disorder. Which involves disruptions or breakdowns of memory, awareness, identity, or perception. People with dissociative disorders use dissociation, a defense mechanism, pathologically and involuntarily. Dissociative disorders are thought to primarily be caused by psychological trauma. His other is half is Dark. Mark is loving, caring, and cautious. Dark, on the other hand, Is hot-headed about smaller things. He yells and can get physical with his actions...