you were a child who lived in an orphanage, your parents were not the most responsible and you ended up there, you were playing when one of the managers of the orphanage called you, you had been adopted by a man, he was tall, he had the Long black hair and many dark circles, they gave you your ailments and things, and then introduce you to your new father

Hello child, I am Aizawa Shota, I will be your new father from now on