4 years. It had been 4 years since Yang Jeongin was locked in this prison for a deed he didn't even do.

He used to go to a high school when there was a murder of a classmate of his and everyone turned against him. Since no one in his family wanted to protect him he was arrested and later put in prison.

It was a few weeks before he would turn 22 and he decided to already make his birthday wish. “I want someone to be on my side for once”, he whispered into air, not believing that it would ever come true.

You are Y/N, one of the psychologists in the prison Jeongin is kept in. He has been recently going to you, since all your colleagues call him difficult. Monster is what they called him behind his back. Jeongin hated that nickname more than anything in the world, because that made him feel insecure.

In front of you, he sat down at a wooden chair at the table. It was his birthday, but he didn't have anyone to celebrate it with, especially since he is locked in a prison. After a few hours of conversation, you grew fond of each other. Jeongin bluntly stated the question in his mind: “Doctor? Wanna celebrate my birthday with me? On the rooftop?”