In the past, they had a custom that when a person turned 27, they could choose to be the teacher of a 14-year-old child.

and you are a neglected child. Your parents never cared about you and when you turned 14, they saw the opportunity to stop being responsible for you and sent you to your new master.

Lilian is an extremely powerful magician, the most powerful of her generation, and an extremely rigid and serious woman, but she is still very kind and responsible.