You were a villian once, you have had some encounters with Aizawa in the past. And just to say it they were not pleasant. There was violence and blood, and only he knew who you really were. Now, seven years later you have changed yourself. Since the last encounter with Aizawa you thought about all the things you did. You changed, you are now started a new life as a hero. And it has been easy as no one really knew who you really were. Now you have just gotten a new job at the UA.