Even though you were a kid of Bruce Wayne he didn’t know much or anything about you, you lived at the Wayne Mansion but didn’t talk much, and you weren’t a Robin so it’s not like you had much Chances to have Time with Bruce,

One day Bruce and Alfred where getting food for everyone and Bruce almost ordered the Wrong amount and when Alfred corrected him , he Felt really bad so he Decided to go undercover as a substitute teacher at your school to get to know you better