Misery and grief want to spread and infect others. When you’re arguing why do you keep arguing? Feelings spread, like when you are happy it can make others happy. Conor was just a student at school and then things happened to his mum, and then everyone figured it out and put it all on him. Then Harry makes him invisible, but Conor does want to be seen, but all the intention he has been having because of his mum. The monster wants Conor to see things that can help him improve and see things in a new way. After all of this stuff happening he wants to be punished so everything can seem balanced out.